# List of lichens of Maryland

The following list of lichens of Maryland is derived from the following sources:
* (1) lichens listed in the 1977 publication by Skorepa (Allen C. Skorepa), Norden , and Windler.
* (2) lichens listed in the 1979 publication by Skorepa, Norden, and Windler.
* (3) lichens listed in the 2002 publication by Biechele as occurring on Maryland's Delmarva Peninsula.
* (4) lichens in Elmer Worthley's personal herbarium.
* (5) lichens found in Maryland by Edward Uebel.
* (6) lichens reported on Maryland's Delmarva Peninsula by Lendemer and Knapp (2007) at six locations: 1. Millington State Wildlife Management Area (1. Millington); 2. Idylwild State Wildlife Management Area (2. Idylwild); 3. Chesapeake State Forest (3. Chesapeake); 4. Sharptown Dunes (4. Sharptown); 5. Hickory Point Cypress Swamp (5. Hickory Pt.); 6. Pocomoke State Forest (6. Pocomoke).

## List

* Acarospora fuscata (Schrader) Arnold [Acarosporaceae]
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Carroll Co., on stone wall.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
* Acarospora schleicheri (Ach.) A. Massal. [Acarosporaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Skorepa et al. (1979) – on acidic rock.
* Ahtiana aurescens (Tuck.) Thell & Randlane [Parmeliaceae]
** Syn.: Cetraria aurescens Tuck.
** Skorepa et al. (1977) – Allegany Co., on branches of pines.
** Skorepa et al. (1979) – on bark.
* Allocetraria oakesiana (Tuck.) Randlane & Thell [Parmeliaceae]
** Syn.: Cetraria oakesiana Tuck.
** Skorepa et al. (1977) – Frederick Co., base of oak.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Garrett Co., along Big Run, on stumps.
* Amandinea milliaria (Tuck.) P. May & Sheard [Physciaceae]
** Syn.: Rinodina milliaria Tuck.
** Skorepa et al. (1977) – Calvert Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
* Amandinea polyspora (Willey) E. Lay & P. May [Physciaceae]
** Syn.: Buellia polyspora (Willey) Vainio
** Skorepa et al. (1977) – Carroll Co., bark of deciduous tree.
** Skorepa et al. (1979) – on bark.
** E.C. Uebel Herbarium – Baltimore Co., Ridge Rd., on bark of Norway Maple.
* Amandinea punctata (Hoffm.) Coppins & Scheid. [Physciaceae]
** Syn.: Buellia punctata (Hoffm.) Massal.
** Skorepa et al. (1977) – Worcester Co., on oak twigs.
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Anaptychia palmulata (Michaux) Vainio [Physciaceae]
** Skorepa et al. (1977) – Calvert Co., trunks of deciduous trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Baltimore Co.; Calvert Co.; Frederick Co.
* Anisomeridium polypori (Ellis & Everh.) M.E. Barr [Monoblastiaceae]
** Lendemer & Knapp (2007) - (4. Sharptown)
* Anzia americana Yoshim. & Sharp [Parmeliaceae]
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Anzia colpodes (Ach.) Stizenb. [Parmeliaceae]
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Arctoparmelia centrifuga? (L.) Hale [Parmeliaceae]
** E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
* Arthonia caesia (Flotow) Körber [Arthoniaceae]
** Skorepa et al. (1977) – Baltimore Co., trunk of oak.
** Skorepa et al. (1979) – on bark.
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on bark; Ridge Road, on bark.
** Lendemer & Knapp (2007) (1. Millington)
* Arthonia rubella (Fée) Nyl. [Arthoniaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Arthopyrenia cinereopruinosa (Schaerer) A. Massal. [Arthopyreniaceae]
** Syn.: Arthopyrenia pinicola (Hepp) Mass.
** Skorepa et al. (1977) – Montgomery Co., trunk of elm.
** Skorepa et al. (1979) – on bark.
* Arthothelium interveniens (Nyl.) Zahlbr. [Arthoniales]
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Aspicilia caesiocinerea (Nyl. ex Malbr.) Arnold [Hymeneliaceae]
** Syn.: Lecanora caesiocinerea Nyl.
** Skorepa et al. (1977) – Allegany Co., on shale outcrop.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Montgomery Co., Great Falls.
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on acidic rock.
* Aspicilia cinerea (L.) Körber [Hymeneliaceae]
** Syn.: Lecanora cinerea (L.) Somm.
** Skorepa et al. (1977) – Baltimore Co., on rock ledges.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
* Bacidia laurocerasi (Delise ex Duby) Zahlbr. subsp. laurocerasi [Bacidiaceae]
** Syn.: Bacidia atrogrisea (Delilse ex Hepp) Körber
** Skorepa et al. (1979) – on bark.
* Bacidia polychroa (Th. Fr.) Körber [Bacidiaceae]
** Syn.: Bacidia fuscorubella (Hoffm.) Bausch.
** Skorepa et al. (1977) – Baltimore Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – on bark.
* Bacidia schweinitzii (Fr. ex E. Michener) A. Schneider [Bacidiaceae]
** Skorepa et al.. (1977) – Montgomery Co., on oak.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium – Lichens of Soldiers Delight; Anne Arundel Co., Baltimore Co., Wicomico Co.
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown), (5. Hickory Pt.), (6. Pocomoke)
* Bacidia trachona (Ach.) Lettau [Bacidiaceae]
** Skorepa et al. (1979) – on calcareous rock.
* Bacidina egenula (Nyl.) Vězda [Bacidiaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Bacidina inundata (Fr.) Vezda [Bacidiaceae]
** Skorepa et al. (1979) – on bark.
* Baculifera curtisii (Tuck.) Marbach [Physciaceae]
** Syn.: Buellia curtisii (Tuck.) Imsh.
** Skorepa et al.. (1977) – Calvert Co., trunk of deciduous tree.
** Skorepa et al. (1979) – on bark.
* Bathelium carolinianum (Tuck.) R.C. Harris [Trypetheliaceae]
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Biatora vernalis (L.) Fr. [Bacidiaceae]
** Syn.: Lecidea vernalis (L.) Ach.
** Skorepa et al. (1977) – Frederick Co., on trunks of oaks.
** Skorepa et al. (1979) – on bark.
* Brigantiaea leucoxantha (Spreng.) R. Sant. & Haffel. [Brigantiaeaceae]
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Bryoria furcellata (Fr.) Brodo & D. Hawksw. [Parmeliaceae]
** Syn.: Alectoria nidulifera Norrl.
** Skorepa et al. (1977) – Garrett Co., on pine trunks.
** Skorepa et al. (1979) – on bark, acid rock.
** E.G. Worthley Herbarium - Wicomico Co.
* Buellia badia (Fr.) Massal. [Physciaceae]
** Syn.: Buellia turgescens Tuck.
** E.G. Worthley Herbarium - Baltimore Co., St. Thomas Cemetery.
* Buellia curtisii (Tuck.) Imshaug [Physciaceae]
** Lendemer & Knapp (2007) (1. Millington), (3. Chesapeake)
* Buellia spuria (Schaerer) Anzi [Physciaceae]
** Skorepa et al. (1977) – Montgomery Co. (collection by Fink)
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium – Lichens of Soldiers Delight.
* Buellia stigmaea Tuck. [Physciaceae]
** Skorepa et al. (1977) – Baltimore Co., (collected by Plitt)
** Skorepa et al. (1979) – on acidic rock.
* Buellia stillingiana J. Steiner [Physciaceae]
** Skorepa et al. (1977) – Calvert Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Worcester Co.
** Lendemer & Knapp (2007) - (4. Sharptown)
* Buellia vernicoma Tuck. [Physciaceae]
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Byssoloma leucoblepharum Vainio [Pilocarpaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Byssoloma meadii (Tuck.) S. Ekman [Pilocarpaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Calicium salicinum Pers. [Caliciaceae]
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Caloplaca camptidia (Tuck.) Zahlbr. [Teloschistaceae]
** Skorepa et al. (1977) – Montgomery Co., oak woods.
** Skorepa et al. (1979) – on bark.
* Caloplaca cerina (Ehrh. ex Hedwig) Th. Fr. [Teloschistaceae]
** Skorepa et al. (1977) – Garrett Co., on aspen trunks.
** Skorepa et al. (1979) – on bark.
* Caloplaca citrina (Hoffm.) Th. Fr. [Teloschistaceae]
** Skorepa et al. (1977) – Baltimore Co., on concrete bridge.
** Skorepa et al. (1979) – on cement.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium – Lichens of Soldiers Delight; Baltimore Co., on wall of stone and cement.
* Caloplaca feracissima H. Magn. [Teloschistaceae]
** Skorepa et al. (1977) – Frederick Co., on concrete.
** Skorepa et al. (1979) – on cement.
** E.G. Worthley Herbarium – Lichens of Soldiers Delight.
** E.C. Uebel Herbarium – Prince George's Co., on hill of concrete.
* Caloplaca flavorubescens (Hudson) J. R. Laundon [Teloschistaceae]
** Syn.: Caloplaca aurantiaca (Lightf.) Th. Fr.
** Skorepa et al. (1977) – Allegany Co., on cement.
** Skorepa et al. (1979) – on cement.
** E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
* Caloplaca flavovirescens (Wulfen) Dalla Torre & Sarnth.
** Skorepa et al. (1977) – Washington Co., on limestone.
** Skorepa et al. (1979) – on calcareous rock, cement.
* Caloplaca holocarpa (Hoffm. ex Ach.) M. Wade [Teloschistaceae]
** Skorepa et al. (1977) – Frederick Co., on timbers.
** Skorepa et al. (1979) – on bark, calcareous rock, wood.
* Caloplaca lobulata (Flörke) de Lesd. [Teloschistaceae]
** Skorepa et al. (1977) – Cecil Co., on serpentine rock.
** Skorepa et al. (1979) – acidic rock.
** E.G. Worthley Herbarium – Lichens of Soldiers Delight; Baltimore Co., on bricks.
* Caloplaca microphyllina (Tuck.) Hasse [Teloschistaceae]
** Skorepa et al. (1979) – wood.
* Caloplaca oxfordensis Fink [Teloschistaceae]
** Skorepa et al. (1977) – Washington Co., on limestone.
** Skorepa et al. (1979) – on acidic rock.
* Caloplaca sideritis (Tuck.) Zahlbr. [Teloschistaceae]
** Skorepa et al. (1977) – Frederick Co., on cement foundation.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium – Lichens of Soldiers Delight.
* Caloplaca subsoluta (Nyl.) Zahlbr. [Teloschistaceae]
** Syn.: Caloplaca modesta (Zahlbr.) Fink
** Skorepa et al. (1977) – Montgomery Co. (collected by Fink)
** Skorepa et al. (1979) – on acidic rock.
* Candelaria concolor (Dickson) B. Stein [Candelariaceae]
** Skorepa et al. (1977) – Allegany Co., on tree trunk.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium – Lichens of Soldiers Delight; Frederick Co.; Carroll Co.
** E.C. Uebel Herbarium – Baltimore Co.; Prince George's Co., on bark.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Candelariella reflexa (Nyl.) Lettau [Candelariaceae]
** Lendemer & Knapp (2007) - (3. Chesapeake)
* Candelariella vitellina (Hoffm.) Müll. Arg. [Candelariaceae]
** Skorepa et al. (1977) – Baltimore Co., on rock face.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium – Lichens of Soldiers Delight.
* Canoparmelia caroliniana (Nyl.) Elix & Hale [Parmeliaceae]
** Syn.: Parmelia caroliniana Nyl.
** Skorepa et al. (1977) – Worcester Co., on tree trunks.
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown), (6. Pocomoke)
* Canoparmelia crozalsiana (de Lesd. ex Harm.) Elix & Hale [Parmeliaceae]
** Syn.: Parmelia crozalsiana B. de Lesd. ex Harm.
** Skorepa et al. (1977) – Frederick Co., on trunk of oak.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Talbot Co., on Sycamore.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Canoparmelia texana (Tuck.) Elix & Hale [Parmeliaceae]
** Syn.: Parmelia texana Tuck.
** Skorepa et al. (1977) – Frederick Co., on trunk of maple.
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Catapyrenium cinereum (Pers.) Körber [Verrucariaceae]
** Syn.: Dermatocarpon hepaticum (Ach.) Th. Fr.
** Skorepa et al. (1979) – on soil.
** E.G. Worthley Herbarium – Lichens of Soldiers Delight.
* Catillaria chalybeia (Borrer) A. Massal. [Catillariaceae]
** Skorepa et al. (1977) – Frederick Co., on rocks.
** Skorepa et al. (1979) – on acidic rock.
* Cetraria arenaria Kärnefelt [Parmeliaceae]
** Syn.: Cetraria islandica (L.) Ach.
** Skorepa et al. (1977) – Garrett Co., on soil.
** Skorepa et al. (1979) – on soil.
** E.G. Worthley Herbarium - Garrett Co., Carey Run.
* Cetrelia cetrarioides (Duby) Culb. & C. Culb. [Parmeliaceae]
** E.G. Worthley Herbarium - Baltimore Co., Owings Mills, on oak.
* Cetrelia chicitae (W. Culb.) W. Culb. & C. Culb. [Parmeliaceae]
** Skorepa et al. (1977) – Garrett Co., on conglomerate.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Frederick Co., Mt. Catoctin Park.
* Cetrelia olivetorum (Nyl.) Culb. & C. Culb. [Parmeliaceae]
** Skorepa et al. (1977) – Allegany Co., on trunk of deciduous tree.
** Skorepa et al. (1979) – on bark.
* Chrismofulvea dialyta (Nyl.) Marbach [Physciaceae]
** Syn.: Buellia dialyta (Nyl.) Tuck.
** Skorepa et al. (1979) – on bark.
* Chrysothrix candelaris (L.) J. R. Laundon [Chrysotrichaceae]
** Syn.: Lepraria candelaris (L.) Fr.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Montgomery Co., on rock outcrop.
** E.C. Uebel Herbarium – Baltimore Co., Hollofield, on rock cliff.
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Chrysothrix flavovirens Tønsberg s. lat. [Chrysotrichaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Cladonia apodocarpa Robbins [Cladoniaceae]
** Skorepa et al. (1977) – Frederick Co., on soil.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Gunpowder Falls; Allegany Co.
* Cladonia arbuscula (Wallr.) Flotow [Cladoniaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Allegany Co., Green Ridge State Forest; Wicomico Co.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
* Cladonia atlantica A. Evans [Cladoniaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Biechele (2002) – lower eastern shore of Maryland.
* Cladonia beaumontii (Taylor) Vainio [Cladoniaceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Cladonia boryi Tuck. [Cladoniaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** This is probably a misidentification of Cladonia caroliniana.
* Cladonia caespiticia (Pers.) Flörke [Cladoniaceae]
** Skorepa et al. (1977) – Worcester Co., on sandy soil.
** Biechele (2002) – lower eastern shore of Maryland.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight; Carroll Co., Liberty Reservoir.
* Cladonia cariosa (Ach.) Sprengel [Cladoniaceae]
** E.G. Worthley Herbarium - Lichens of Soldiers Delight.
* Cladonia caroliniana Tuck. [Cladoniaceae]
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
* Cladonia cervicornis subsp. verticillata (Hoffm.) Ahti [Cladoniaceae]
** Syn.: Cladonia verticillata (Hoffm.) Schaer.
** Skorepa et al. (1977) – Queen Anne's Co., on soil.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Worcester Co.; Queen Anne's Co.; Baltimore Co.
* Cladonia chlorophaea (Flörke ex Sommerf.) Sprengel [Cladoniaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Prince George's Co.; Anne Arundel Co.; Washington Co.
* Cladonia coniocraea (Flörke) Sprengel [Cladoniaceae]
** Skorepa et al. (1977) – Garrett Co., on base of pine.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Baltimore Co.; Calvert Co.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight; Baltimore Co., Liberty Reservoir.
* Cladonia cristatella Tuck. [Cladoniaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Prince George's Co.; Garrett Co., Swallow Falls.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight; Prince George's Co., Greenbelt.
* Cladonia didyma (Fée) Vainio var. didyma [Cladoniaceae]
** Lendemer & Knapp (2007) - (2. Idylwild)
* Cladonia fimbriata (L.) Fr. [Cladoniaceae]
** Skorepa et al. (1977) – Garrett Co., on sandstone boulder.
** E.G. Worthley Herbarium - Garrett Co.; Allegany Co., Green Ridge State Forest.
* Cladonia floerkeana (Fr.) Flörke [Cladoniaceae]
** Skorepa et al. (1977) – Harford Co., on rotting wood.
* Cladonia furcata (Hudson) Schrader [Cladoniaceae]
** Skorepa et al. (1977) – Harford Co., on moss.
* Cladonia gracilis (L.) Willd. subsp. gracilis [Cladoniaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight.
* Cladonia grayi Merr. ex Sandst. [Cladoniaceae]
** Biechele (2002) – lower eastern shore of Maryland.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
** Lendemer & Knapp (2007) - (2. Idylwild), (3. Chesapeake)
* Cladonia incrassata Flörke [Cladoniaceae]
** Skorepa et al. (1977) – Wicomico Co., on sandy soil.
** Lendemer & Knapp (2007) - (2. Idylwild), (6. Pocomoke)
* Cladonia macilenta Hoffm. [Cladoniaceae]
** Skorepa et al. (1977) – Harford Co., on rotting wood.
** E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir; Prince Georges Co., College Park.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Cladonia macilenta var. bacillaris (Genth) Schaerer [Cladoniaceae]
** Syn.: Cladonia bacillaris (Ach.) Nyl.
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Prince George's Co.
** E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir.
** Lendemer & Knapp (2007) - (3. Chesapeake)
* Cladonia mateocyatha Robbins [Cladoniaceae]
** Skorepa et al. (1977) – Baltimore Co., on exposed rocks.
* Cladonia ochrochlora Flörke [Cladoniaceae]
** Lendemer & Knapp (2007) - (1. Millington)
* Cladonia parasitica (Hoffm.) Hoffm. [Cladoniaceae]
** Skorepa et al. (1977) – Worcester Co., on pine stump.
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Cladonia peziziformis (With.) J.R. Laundon [Cladoniaceae]
** Syn.: Cladonia capitata (Michx.) Spreng.
** Skorepa et al. (1977) – Kent Co., on embankment.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight; Prince George's Co., Greenbelt.
* Cladonia piedmontensis G. Merr. [Cladoniaceae]
** Skorepa et al. (1977) – Wicomico Co., on soil.
** E.G. Worthley Herbarium - Baltimore Co.; Wicomico Co.
* Cladonia pleurota (Flörke) Schaerer [Cladoniaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Biechele (2002) – lower eastern shore of Maryland.
* Cladonia polycarpia G. Merr. [Cladoniaceae]
** Lendemer & Knapp (2007) - (3. Chesapeake)
* Cladonia polycarpoides Nyl. [Cladoniaceae]
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Cladonia pyxidata (L.) Hoffm. [Cladoniaceae]
** Skorepa et al. (1977) – Allegany Co., on bank of stream.
** E.G. Worthley Herbarium - Allegany Co., Green Ridge State Forest; Anne Arundel Co.; Carroll Co.; Washington Co.
* Cladonia ramulosa (With.) J.R. Laundon [Cladoniaceae]
** E.G. Worthley Herbarium - Worcester Co., Milburn Landing.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Cladonia rangiferina (L.) F.H. Wigg. [Cladoniaceae]
** Skorepa et al. (1977) – Allegany Co., on soil.
** E.G. Worthley Herbarium - Calvert Co.; Wicomico Co.
* Cladonia rappii A. Evans [Cladoniaceae]
** Syn.: Cladonia calycantha Del. ex Nyl.
** Skorepa et al. (1977) – Charles Co., on soil.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Wicomico Co.
* Cladonia ravenelii Tuck. [Cladoniaceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Cladonia rei Schaerer [Cladoniaceae]
** Syn.: Cladonia nemoxyna (Ach.) Nyl.
** Skorepa et al. (1977) – Garrett Co., on rocky soil.
** E.G. Worthley Herbarium - Garrett Co.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
* Cladonia santensis Tuck. [Cladoniaceae]
** Skorepa et al. (1977) – Dorchester Co., on soil.
** Biechele (2002) – lower eastern shore of Maryland.
* Cladonia squamosa Hoffm. [Cladoniaceae]
** Skorepa et al. (1977) – Frederick Co., on basalt outcrop.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Washington Co.
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Cladonia stellaris (Opiz) Pouzar & Vezda [Cladoniaceae]
** Syn.: Cladonia alpestris (L.) Rabenh.
** Skorepa et al. (1977) – Garrett Co., on soil.
* Cladonia strepsilis (Ach.) Grognot [Cladoniaceae]
** Skorepa et al. (1977) – Prince George's Co., on shoulder of road.
** E.G. Worthley Herbarium - Prince George's Co.
* Cladonia subcariosa Nyl. [Cladoniaceae]
** Syns.: Cladonia clavulifera Vain., C. sobolescens Nyl. ex Vain.
** Skorepa et al. (1977) – Worcester Co., on sandy soil.
** Skorepa et al. (1977) – Kent Co., on soil.
** E.G. Worthley Herbarium - St. Mary's Co.; Wicomico Co.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight; Prince George's Co., Greenbelt.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Cladonia subtenuis (Abbayes) Mattick [Cladoniaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Allegany Co.; Calvert County; St. Mary's Co.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight; Prince George's Co.
** Lendemer & Knapp (2007) - (2. Idylwild), (3. Chesapeake), (4. Sharptown)
* Cladonia turgida Hoffm. [Cladoniaceae]
** Skorepa et al. (1977) – Wicomico Co., on soil.
* Cladonia uncialis (L.) F.H. Wigg. [Cladoniaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Biechele (2002) – lower eastern shore of Maryland.
* Coccocarpia palmicola (Sprengel) Arv. & D.J. Galloway [Coccocarpiaceae]
** Syn.: Coccocarpia cronia (Tuck.) Vain.
** Skorepa et al. (1977) – Montgomery Co., on rock outcrop.
** Skorepa et al. (1979) – on bark, acidic rock.
* Coenogonium luteum (Dicks.) Kalb & Lücking [Gyalectaceae]
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Coenogonium pineti (Ach.) Kalb & Lücking [Gyalectaceae]
** Syn.: Dimerella diluta (Pers.) Trevisan
** Skorepa et al. (1979) – on wood, other.
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Collema coccophorum Tuck. [Collemataceae]
** Skorepa et al. (1979) – on acidic rock.
* Collema conglomeratum Hoffm. [Collemataceae]
** Skorepa et al. (1979) – on bark.
* Collema furfuraceum (Arnold) Du Rietz [Collemataceae]
** Skorepa et al. (1977) – Allegany Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – bark, acidic rock.
** E.G. Worthley Herbarium - Allegany Co., Terrapin Run, near base of tree trunk.
* Collema fuscovirens (With.) J.R. Laundon [Collemataceae]
** Syn.: Collema tuniforme (Ach.) Ach.
** Skorepa et al. (1979) – on calcareous rock.
* Collema leptaleum Tuck. [Collemataceae]
** Skorepa et al. (1979) – on bark.
* Collema subflaccidum Degel. [Collemataceae]
** Skorepa et al. (1979) – acidic rock.
** E.G. Worthley Herbarium - Baltimore Co., Gunpowder River, on bark of Tulip Tree.
* Collema undulatum Laurer ex Flotow [Collemataceae]
** Skorepa et al. (1979) – on acidic rock.
* Cyphelium tigillare (Ach.) Ach. [Caliciaceae]
** Skorepa et al. (1979) – on wood.
* Dactylospora inquilina Hafellner [Dactylosporaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.) (on Pertusaria paratuberculifera)
* Dermatocarpon luridum (With.) J.R. Laundon [Verrucariaceae]
** Syn.: Dermatocarpon fluviatile (G. Web.) Th. Fr.
** Skorepa et al. (1977) – Baltimore Co., on rocks.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Carroll Co., in stream bed; Frederick Co., on boulder in stream.
** E.C. Uebel Herbarium – Baltimore Co., Hollofield, on moist rock.
* Dermatocarpon miniatum (L.) W. Mann [Verrucariaceae]
** Skorepa et al. (1977) – Baltimore Co., on rock ledge.
** Skorepa et al. (1979) – on acidic rock, calcareous rock.
** E.G. Worthley Herbarium - Montgomery Co., Great Falls
* Dibaeis baeomyces (L. f.) Rambold & Hertel [Icmadophilaceae]
** Syn.: Baeomyces roseus Pers.
** Skorepa et al. (1977) – Harford Co., on rock ledge.
** Skorepa et al. (1979) – on soil.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Howard Co.
* Dimelaena oreina (Ach.) Norman [Physciaceae]
** Skorepa et al. (1977) – Allegany Co., on sandstone outcrop.
** Skorepa et al. (1979) – on acidic rock.
* Diploschistes scruposus (Schreber) Norman [Thelotremataceae]
** Skorepa et al. (1979) – on acidic rock.
* Dirinaria frostii (Tuck.) Hale & Culb. [Physciaceae]
** Skorepa et al. (1977) – Allegany Co., on shale outcrops.
** Skorepa et al. (1979) – on acidic rock.
* Endocarpon petrolepideum (Nyl.) Nyl. [Verrucariaceae]
** E.C. Uebel Herbarium – Prince George's Co., Greenbelt, on hill of concrete (identified by Dr. Othmar Breuss, Vienna, Austria, Mar 2005).
* Endocarpon pusillum Hedwig [Verrucariaceae]
** Skorepa et al. (1977) – Washington Co., on chert.
** Skorepa et al. (1979) – on calcareous rock, cement.
* Ephebe lanata (L.) Vainio [Lichinaceae]
** Skorepa et al. (1979) – on acidic rock.
* Fissurina insidiosa Hook. & C. Knight [Graphidaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Flavoparmelia baltimorensis (Gyelnik & Fóriss) Hale [Parmeliaceae]
** Syn.: Parmelia baltimorensis Gyelnik & Fóriss
** Skorepa et al. (1977) – Baltimore Co., on rock outcrops.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Harford Co., Rocks State Park, on acidic rock.
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on boulders.
* Flavoparmelia caperata (L.) Hale [Parmeliaceae]
** Syn.: Parmelia caperata (L.) Ach.
** Skorepa et al. (1977) – Lichens of Soldiers Delight, on rocks.
** Skorepa et al. (1979) – on bark, acidic rock.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Calvert Co.; Frederick Co.; Worcester Co., on bark.
** E.C. Uebel Herbarium – Prince George's Co., on fallen tree limbs.
** Lendemer & Knapp (2007) - (4. Sharptown)
* Flavopunctelia flaventior (Stirton) Hale [Parmeliaceae]
** Syn.: Parmelia flaventior Stirt.
** Skorepa et al. (1977) – Garrett Co., on oak.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Allegany Co.; Garrett Co., Casselman Bridge State Park.
* Flavopunctelia soredica (Nyl.) Hale [Parmeliaceae]
** Syn.: Parmelia ulophyllodes (Vaino) Savicz
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Baltimore Co., Gunpowder State Park.
** E.C. Uebel Herbarium – Baltimore Co., Ridge Rd., on bark of Norway Maple.
* Fuscopannaria leucophaea (Vahl) P.M. Jørg. [Pannariaceae]
** Syn.: Parmeliella microphylla (Sw.) Müll. Arg.
** Skorepa et al. (1979) – on acidic rock.
* Fuscopannaria leucosticta (Tuck.) P.M. Jørg. [Pannariaceae]
** Syn.: Pannaria leucosticta (Tuck.) Tuck. ex Nyl.
** Skorepa et al. (1979) – on bark.
* Gassicurtia vernicoma (Tuck.) Marbach [Physciaceae]
** Syn.: Buellia vernicoma (Tuck.) Tuck.
** Skorepa et al. (1977) – (collected by Plitt)
** Skorepa et al. (1979) – on bark.
* Graphis scripta (L.) Ach. [Graphidaceae]
** Skorepa et al. (1977) – Montgomery Co., on oak.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Baltimore Co., Pretty Boy Reservoir; Wicomico Co.
** E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir, on tree bark.
* Hafellia disciformis (Fr.) Marbach & H. Mayrhofer [Physciaceae]
** Syn.: Buellia disciformis (Fr.) Mudd
** Skorepa et al. (1977) – Anne Arundel Co.
** Skorepa et al. (1979) – on bark.
* Hertelidea botryosa (Fr.) Printzen & Kantvilas [Stereocaulaceae]
** Syn.: Lecidea botryosa (Fr.) Th. Fr.
** Skorepa et al. (1979) – on wood.
* Heterodermia albicans (Pers.) Swinscow & Krog [Physciaceae]
** Syn.: Heterodermia domingensis (Ach.) Trev.
** Skorepa et al. (1977) – Wicomico Co., on tree trunks.
** Skorepa et al. (1979) – on bark.
* Heterodermia appalachensis (Kurok.) Culb. [Physciaceae]
** Skorepa et al. (1977) – Baltimore Co., on trunk of oak.
* Heterodermia granulifera (Ach.) Culb. [Physciaceae]
** Skorepa et al. (1977) – Montgomery Co., on trunk of Walnut tree.
** Skorepa et al. (1979) – on bark.
* Heterodermia hypoleuca (Muhl.) Trevisan [Physciaceae]
** Skorepa et al. (1977) – Frederick Co, on oak.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
* Heterodermia obscurata (Nyl.) Trevisan [Physciaceae]
** Skorepa et al. (1977) – Charles Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Baltimore Co., Gunpowder Falls, on tree trunk.
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown)
* Heterodermia speciosa (Wulfen) Trevisan [Physciaceae]
** Syn.: Heterodermia tremulans (Müll. Arg.) W. Culb.
** Skorepa et al. (1977) – Washington Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Baltimore Co., Pretty Boy Dam.
** Lendemer & Knapp (2007) - (2. Idylwild), (6. Pocomoke)
* Hymenelia epulotica (Ach.) Lutzoni [Hymeneliaceae]
** Syn.: Ionaspis epulotica (Ach.) Blomb. & Forssell
** Skorepa et al. (1979) – on acidic rock.
* Hyperphyscia adglutinata (Flörke) H. Mayrh. [Physciaceae]
** Syn.: Physciopsis adglutinata (Flörke) M. Choisy
** Skorepa et al. (1979) – on bark.
* Hyperphyscia syncolla (Tuck. ex Nyl.) Kalb [Physciaceae]
** Syns.: Physcia syncolla Tuck. ex Nyl., Physciopsis syncolla (Tuck. ex Nyl.) Poelt
** Skorepa et al. (1977) – Wicomico Co., on oak trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
* Hypocenomyce scalaris (Ach.) M. Choisy [Lecideaceae]
** Syn.: Lecidea scalaris (Ach. ex Lilj.) Ach.
** Skorepa et al. (1979) – on bark, wood.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight, on trunk of pine.
* Hypogymnia krogiae Ohlsson [Parmeliaceae]
** Skorepa et al. (1977) – Garrett Co., on conifer bark.
** Skorepa et al. (1979) – on bark.
* Hypogymnia physodes (L.) Nyl. [Parmeliaceae]
** Skorepa et al. (1977) – Garrett Co., on tree trunks.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
* Hypotrachyna livida (Taylor) Hale [Parmeliaceae]
** Syn.: Parmelia livida Taylor
** Skorepa et al. (1977) – Sommerset Co., on branches of deciduous trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Wicomico Co.; Worcester Co., Milburn Landing, on branches.
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown), (6. Pocomoke)
* Hypotrachyna osseoalba (Vainio) Park & Hale [Parmeliaceae]
** Syn.: Parmelia formosana Zahlbr.
** Skorepa et al. (1977) – Dorchester Co., on oak trunk.
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (4. Sharptown)
* Imshaugia aleurites (Ach.) S.F. Meyer [Parmeliaceae]
** Syn.: Parmeliopsis aleurites (Ach.) Nyl.
** Skorepa et al. (1977) – Garrett Co., on oak trunk.
** Skorepa et al. (1979) – on bark, acidic rock, wood.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight, on Virginia pines.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight, on trunks of pines.
* Imshaugia placorodia (Ach.) S.F. Meyer [Parmeliaceae]
** Syn.: Parmeliopsis placorodia (Ach.) Nyl.
** Skorepa et al. (1977) – Harford Co., on pine trees.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight, on pine branches.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight, on branches of Virginia pines.
* Julella fallaciosa (Arnold) R.C. Harris (Not lichenized.) [Thelenellaceae]
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on bark of Tulip Tree.
* Lasallia papulosa (Ach.) Llano [Umbilicariaceae]
** Syn.: Umbilicaria papulosa (Ach.) Nyl.
** Skorepa et al. (1977) – Baltimore Co., on rocks on hillside.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Frederick Co., Cunningham Falls; Montgomery Co., Great Falls.
* Lasallia pensylvanica (Hoffm.) Llano [Umbilicariaceae]
** Syn.: Umbilicaria pensylvanica Hoffm.
** Skorepa et al. (1977) – Harford Co., on rock outcrops.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Washington Co., Wash. Monument State Park, on rocks.
* Lasallia pustulata (L.) Mérat [Umbilicariaceae]
** E.G. Worthley Herbarium - Frederick Co., South Mt.; Montgomery Co., Sugarloaf Mt., on boulders.
* Lecanora albella (Pers.) Ach. var. albella [Lecanoraceae]
** E.G. Worthley Herbarium - Worcester Co., on bark of Pinus taeda.
* Lecanora cadubriae (A. Massal.) Hedl. [Lecanoraceae]
** Skorepa et al. (1979) – on bark.
* Lecanora caesiorubella Ach. subsp. caesiorubella [Lecanoraceae]
** Skorepa et al. (1977) – Harford Co., on trunk of oak.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Wicomico Co.
* Lecanora campestris (Schaerer) Hue [Lecanoraceae]
** Skorepa et al. (1977) – Allegany Co., on shale outcrop.
** Skorepa et al. (1979) – on acidic rock.
* Lecanora chlarotera Nyl. [Lecanoraceae]
** Skorepa et al. (1977) – Calvert Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
* Lecanora cinereofusca H. Magn. [Lecanoraceae]
** Lendemer & Knapp (2007) - (2. Idylwild), (5. Hickory Pt.), (6. Pocomoke)
* Lecanora dispersa (Pers.) Sommerf. [Lecanoraceae]
** Skorepa et al. (1977) – Washington Co., on stone wall.
** Skorepa et al. (1979) – on calcareous rock, cement, other.
** E.G. Worthley Herbarium - Baltimore Co.; Washington Co., on rock outcrops.
* Lecanora expallens Ach. [Lecanoraceae]
** Syn.: Lecanora conizea (Ach.) Nyl.
** Skorepa et al. (1977) – St. Mary's Co., on trunks of Black Locust.
** Skorepa et al. (1979) – on bark, wood.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; St. Mary' Co., on trunk of Black Locust.
* Lecanora hagenii (Ach.) Ach. [Lecanoraceae]
** Skorepa et al. (1977) – Frederick Co., on old timbers.
** Skorepa et al. (1979) – on wood.
* Lecanora hybocarpa (Tuck.) Brodo [Lecanoraceae]
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (1. Millington), (4. Sharptown), (5. Hickory Pt.), (6. Pocomoke)
* Lecanora imshaugii Brodo [Lecanoraceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Lecanora minutella Nyl. [Lecanoraceae]
** Lendemer & Knapp (2007) - (2. Idylwild)
* Lecanora muralis (Schreber) Rabenh. [Lecanoraceae]
** Skorepa et al. (1977) – Montgomery Co., on rock ledges.
* Lecanora muralis var. versicolor (Pers.) Tuck. [Lecanoraceae]
** Syn.: Lecanora versicolor (Pers.) Ach.
** Skorepa et al. (1977) – Washington Co., on stone wall.
** Skorepa et al. (1979) – on acidic rock.
** Skorepa et al. (1979) – on acidic rock, calcareous rock.
** E.G. Worthley Herbarium - Washington Co., C & 0 canal, on shale.
* Lecanora polytropa (Hoffm.) Rabenh. [Lecanoraceae]
** Skorepa et al. (1979) – on acidic rock.
* Lecanora pulicaris (Pers.) Ach. [Lecanoraceae]
** Syn.: Lecanora coilocarpa (Ach.) Nyl.
** Skorepa et al. (1977) – Calvert Co., on deciduous trees.
** Skorepa et al. (1979) – on bark.
** E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
* Lecanora strobilina (Spreng.) Kieffer [Lecanoraceae]
** Biechele (2002) – lower eastern shore of Maryland.
** E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple; Prince George's Co., on bark of pines.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Lecanora subpallens Zahlbr. - [Lecanoraceae]
** Lendemer & Knapp (2007) - (1. Millington), (2. Idylwild), (4. Sharptown)
* Lecanora thysanophora R.C. Harris [Lecanoraceae]
** Thomas E. Wilson, III (4 Dec 2006) – IMG_9960.JPG, photographed on tree trunk in woodland on eastern side of Baltimore County, MD.
** Lendemer & Knapp (2007) - (1. Millington), (5. Hickory Pt.)
* Lecanora xylophila Hue [Lecanoraceae]
** Syn.: Lecanora laevis Poelt (N.A. records are L. xylophila)
** Skorepa et al. (1977) – Baltimore Co., on wave-washed timbers.
** Skorepa et al. (1979) – on wood.
* Lecidea cyrtidia Tuck. [Lecideaceae]
** Skorepa et al. (1977) – Washington Co., on rocks.
** Skorepa et al. (1979) – on acidic rock.
* Lecidea plebeja Nyl. [Lecideaceae]
** Syn.: Lecidea myriocarpoides Nyl.
** Skorepa et al. (1979) – on wood.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Lecidella stigmatea (Ach.) Hertel & Leuckert [Lecanoraceae]
** Syn.: Lecidea stigmatea Ach.
** Skorepa et al. (1979) – on acidic rock.
* Lepraria caesiella R.C. Harris [Family Not Determined]
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown)
* Lepraria aff. incana (L.) Ach. [Family Not Determined]
** Lendemer & Knapp (2007) - (1. Millington), (2. Idylwild)
* Lepraria lobificans Nyl. [Family Not Determined]
** Syn.: Lepraria finkii (B. de Lesd.) R.C. Harris
** E.G. Worthley Herbarium - Baltimore Co., Gunpowder River Area, on Quercus alba.
** E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir, rock near water.
** Lendemer & Knapp (2007) - (2. Idylwild), (3. Chesapeake)
* Lepraria membranacea (Dickson) Vainio [Family Not Determined]
** Syn.: Leproloma membranaceum (Dickson) Vainio
** E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
* Lepraria neglecta (Nyl.) Erichsen [Family Not Determined]
** Syn.: Lepraria zonata Brodo = L.caesioalba or L. neglecta.
** Skorepa et al. (1977) – Baltimore Co., on acid rocks.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Frederick Co., Cunningham Falls; Montgomery Co., Great Falls.
* Leptogium azureum (Sw.) Mont. [Collemataceae]
** Skorepa et al. (1977) – Montgomery Co., Plummers Is. (collected by Fink).
** Skorepa et al. (1979) – on acidic rock.
* Leptogium cyanescens (Rabenh.) Körber [Collemataceae]
** Skorepa et al. (1977) – Worcester Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – on bark, acidic rock.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Baltimore Co., Gunpowder River, on vertical rocks; Frederick Co., Cunningham Falls.
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Leptogium lichenoides (L.) Zahlbr. [Collemataceae]
** Skorepa et al. (1977) – Allegany Co., on bark of deciduous trees.
** Skorepa et al. (1979) – on bark, acidic rock.
* Leptogium phyllocarpum (Pers.) Mont. [Collemataceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Leptogium subtile (Schrader) Torss. [Collemataceae]
** Syn.: Leptogium minutissimum (Flörke) Fr.
** Skorepa et al. (1977) – Montgomery Co., on rock ledge.
** Skorepa et al. (1979) – on acidic rock.
* Lichenoconium erodens M.S. Christ. & D. Hawksw. [Anamorphic Ascomycetes]
** Lendemer & Knapp (2007) - (5. Hickory Pt.) (on Lecanora cinereofusca)
* Lichenodiplis lecanorae (Vouaux) Dyko & D. Hawksw. [Anamorphic Ascomycetes]
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, a specimen of Pertusaria xanthodes U-243, was collected growing on a small dead oak branch. This crustose lichen contained a lichenicolous fungus and a sample of this fungus was sent to the Farlow Herbarium where it was forwarded to Dr. David Hawksworth, who identified it as Lichenodiplis lecanorae.
* Lobaria pulmonaria (L.) Hoffm. [Lobariaceae]
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
* Lobaria quercizans Michaux [Lobariaceae]
** Skorepa et al. (1977) – Garrett Co., on trunk of deciduous tree.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Loxospora pustulata (Brodo & Culb.) R.C. Harris [Loxosporaceae]
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown)
* Melanelia culbersonii (Hale) Thell [Parmeliaceae]
** Syn.: Cetraria culbersonii Hale
** Skorepa et al. (1977) – Allegany Co., on exposed rock.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Allegany Co., Dans Rock Overlook.
* Melanelixia subaurifera (Nyl.) O. Blanco et al. [Parmeliaceae]
** Syns.: Parmelia subaurifera Nyl., Melanelia subaurifera (Nyl.) Essl.
** Skorepa et al. (1977) – Allegany Co., on deciduous trees.
** Skorepa et al. (1979) – on bark.
** E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
* Melanohalea exasperata (De Not.) O. Blanco et al.. [Parmeliaceae]
** Syns.: Parmelia exasperata De Not., Melanelia exasperata (De Not.) Essl.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
* Metamelanea melambola (Tuck.) Henssen [Lichinaceae]
** Syn.Pyrenopsis melambola (Tuck.) Tuck.
** Skorepa et al. (1979) – on calcareous rock.
* Micarea erratica (Körber) Hertel, Rambold & Pietschmann [Micareaceae]
** Syn.: Lecidea erratica Körber
** Skorepa et al. (1977) – Baltimore Co., on pebbles.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Garrett Co., Carey Run, in open field.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Minutoexcipula mariana V. Atienza* (on Pertusaria) [Family Not Determined]
** Lendemer & Knapp (2007) - (4. Sharptown)
* Mycobilimbia berengeriana (A. Massal.) Hafellner & V. Wirth [Porpidiaceae]
** Syn.: Lecidea berengeriana (Massal.) Nyl.
** Skorepa et al. (1977) – Frederick Co., on oak trunks.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Montgomery Co., Great Falls, on old wood.
* Myelochroa aurulenta (Tuck.) Elix & Hale [Parmeliaceae]
** Syns: Parmelia aurulenta Tuck.
** Skorepa et al. (1977) – Baltimore Co., on rocks.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Baltimore Co., along Gunpowder River, on rock outcrops.
** E.C. Uebel Herbarium – Baltimore County, Liberty Reservoir; Prince George's Co., on bark.
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Myelochroa galbina (Ach.) Elix & Hale [Parmeliaceae]
** Syn.: Parmelia galbina Ach.
** Skorepa et al. (1977) – Allegany Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Allegany Co., along Terrapin Run, on trunks of deciduous trees.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
* Myelochroa metarevoluta (Asah.) Elix & Hale [Parmeliaceae]
** Syn.: Parmelia metarevoluta (Asahina) Hale
** Skorepa et al. (1977) – Montgomery Co., on oak trunk.
** Skorepa et al. (1979) – on bark.
* Myelochroa obsessa (Ach.) Elix & Hale [Parmeliaceae]
** Syn.: Parmelia obsessa Ach.
** Skorepa et al. (1977) – Baltimore Co., on acid rocks.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Baltimore Co., near Little Gunpowder River, on rock ledges.
* Nadvornikia sorediata R.C. Harris [Thelotremataceae]
** Lendemer & Knapp (2007) - (1. Millington), (5. Hickory Pt.), (6. Pocomoke)
* Nephroma helveticum Ach. subsp. helveticum [Nephromataceae]
** Skorepa et al. (1977) – Montgomery Co., Plummers Is. (collected by Fink).
** Skorepa et al. (1979) – on acidic rock.
* Normandina pulchella (Borrer) Nyl. [Verrucariaceae]
** Skorepa et al. (1979) – on bark.
* Ochrolechia androgyna (Hoffm.) Arnold [Pertusariaceae]
** Skorepa et al. (1977) – Anne Arundel Co.
** Skorepa et al. (1979) – on acidic rock.
* Ochrolechia cinera Chev. [Pertusariaceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Ochrolechia pseudopallescens Brodo [Pertusariaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Ochrolechia trochophora var. trochophora (Vainio) Oshio [Pertusariaceae]
** Syn.: Ochrolechia rosella (Müll. Arg.) Vers.
** Biechele (2002) – lower eastern shore of Maryland.
* Ochrolechia yasudae Vainio [Pertusariaceae]
** Skorepa et al. (1977) – Frederick Co. (collected by Plitt).
** Skorepa et al. (1979) – on acidic rock.
* Opegrapha varia Pers. [Roccellaceae]
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Opegrapha viridis Pers. [Roccellaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Opegrapha vulgata Ach. [Roccellaceae]
** Lendemer & Knapp (2007) - (2. Idylwild), (3. Chesapeake), (4. Sharptown)
* Pannaria conoplea (Ach.) Bory [Pannariaceae]
** Syn.: Pannaria pityrea auct.
** Skorepa et al. (1979) – on bark.
* Pannaria lurida (Mont.) Nyl. [Pannariaceae]
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
* Parmelia saxatilis (L.) Ach. [Parmeliaceae]
** Skorepa et al. (1977) – Frederick Co., in mature oak woods.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Baltimore Co., along Gunpowder River, on bark of Quercus velutina.
* Parmelia squarrosa Hale [Parmeliaceae]
** Skorepa et al. (1977) – Garrett Co., on Acer.
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Parmelia sulcata Taylor [Parmeliaceae]
** Skorepa et al. (1977) – Washington Co., on deciduous trees.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Carroll Co., on bark of Fraxinus americana.
** E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
* Parmelinopsis horrescens (Taylor) Elix & Hale [Parmeliaceae]
** Syn.: Parmelia horrescens Taylor
** Skorepa et al. (1977) – Calvert Co., on trunks of pines.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Worcester Co., Milburn Landing, on bark of Pinus taeda.
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown), (6. Pocomoke)
* Parmelinopsis minarum (Vainio) Elix & Hale [Parmeliaceae]
** Syn.: Parmelia dissecta Nyl.
** Skorepa et al. (1977) – Frederick Co., on oak trunk.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight.
** Lendemer & Knapp (2007) - (2. Idylwild), (5. Hickory Pt.)
* Parmeliopsis ambigua (Wulfen) Nyl. [Parmeliaceae]
** Skorepa et al. (1977) – Garrett Co., on trunk of deciduous tree.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Worcester Co., Milburn Landing, on bark of Pinus taeda.
* Parmeliopsis hyperopta (Ach.) Arnold [Parmeliaceae]
** Syn.: Parmeliopsis diffusa (Weber) Riddle
** E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
* Parmeliopsis subambigua Gyelnik [Parmeliaceae]
** Syn.: Parmeliopsis halei (Tuck.) Hale
** Skorepa et al. (1977) – Worcester Co., on pine trunks.
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (4. Sharptown), (6. Pocomoke)
* Parmotrema cetratum (Ach.) Hale [Parmeliaceae]
** Syns.: Parmelia cetrata Ach, Rimelia cetrata (Ach.) Hale & Fletcher
** Skorepa et al. (1977) – Worcester Co., on trunk of Sweet gum.
** Skorepa et al. (1979) – on bark.
* Parmotrema chinense (Osbeck) Hale & Ahti [Parmeliaceae]
** Syn.: Parmotrema perlatum (Huds.) Choisy
** E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple, on oak limb.
* Parmotrema crinitum (Ach.) M. Choisy [Parmeliaceae]
** Syn.: Parmelia crinita Ach.
** Skorepa et al. (1977) – Worcester Co., on trunk of pine.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Baltimore Co., Owings Mills, on trees.
* Parmotrema dilatatum (Vainio) Hale [Parmeliaceae]
** Syn.: Parmelia dilatata Vainio
** Skorepa et al. (1977) – Dorchester Co., on trunks of deciduous trees.
** Skorepa et al. (1979) – on bark.
* Parmotrema eurysacum (Hue) Hale [Parmeliaceae]
** Syn.: Parmelia eurysaca Hue
** Skorepa et al. (1977) – Baltimore Co. (collected by Plitt).
** Skorepa et al. (1979) – on bark.
* Parmotrema gardneri (Dodge) Serux. [Parmeliaceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Parmotrema hypoleucinum (B. Stein) Hale [Parmeliaceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Parmotrema hypoleucinum (J. Steiner) Hale [Parmeliaceae]
** Lendemer & Knapp (2007) - (4. Sharptown), (6. Pocomoke)
* Parmotrema hypotropum (Nyl.) Hale [Parmeliaceae]
** Syn.: Parmelia hypotropa Nyl.
** Skorepa et al. (1977) – Kent Co., on trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Kent Co., on trees; Somerset Co., on deciduous trees; Wicomico Co.; Worcester Co., on bark of Pinus taeda.
** E.C. Uebel Herbarium – Baltimore Co.; Prince George's Co., on bark and boulder.
** Lendemer & Knapp (2007) - (1. Millington), (2. Idylwild), (4. Sharptown), (6. Pocomoke)
* Parmotrema margaritatum (Hue) Hale [Parmeliaceae]
** Syn.: Parmelia margaritata Hue
** Skorepa et al. (1979) – on bark.
* Parmotrema perforatum (Jacq.) A. Massal. [Parmeliaceae]
** Syn.: Parmelia perforata (Jacq.) Ach.
** Skorepa et al. (1977) – Charles Co., on deciduous trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Prince George's Co., on bark of oak; Worcester Co., Milburn Landing.
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Parmotrema reticulatum (Taylor) M. Choisy [Parmeliaceae]
** Syns.: Parmelia reticulata Taylor, Rimelia reticulata (Taylor) Hale & Fletcher
** Skorepa et al. (1977) – Charles Co., on deciduous trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Worcester Co., on bark of Taxodium and Acer rubrum.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
* Parmotrema stuppeum (Taylor) Hale [Parmeliaceae]
** Syn.: Parmelia stuppea Taylor
** Skorepa et al. (1977) – Garrett Co., on trunk of oak.
** Skorepa et al. (1979) – on bark.
** E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple.
* Parmotrema subisidiosum (Müll. Arg.) Hale
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (2. Idylwild), (5. Hickory Pt.), (6. Pocomoke)
* Parmotrema submarginale (Michx.) DePriest & Hale [Parmeliaceae]
** Syn.: Parmelia michauxiana Zahlbr.
** Skorepa et al. (1977) – Charles Co., on deciduous trees.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Calvert Co., Battle Creek Cypress Swamp, on bark; Worcester Co., Milburn Landing, on deciduous trees.
** Lendemer & Knapp (2007) - (4. Sharptown), (5. Hickory Pt.), (6. Pocomoke)
* Parmotrema subtinctorium (Zahlbr.) Hale [Parmeliaceae]
** Syn.: Parmelia subcrinita Nyl.
** Skorepa et al. (1977) – Somerset Co., on deciduous trees.
** Skorepa et al. (1979) – on bark.
* Parmotrema xanthinum (Müll. Arg.) Hale [Parmeliaceae]
** Syn.: Parmelia xanthina (Müll. Arg.) Vainio
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Peltigera aphthosa (L.) Willd. [Peltigeraceae]
** Skorepa et al. (1977) – No County, (Thomson, 1940).
* Peltigera canina (L.) Willd. [Peltigeraceae]
** Skorepa et al. (1977) – Garrett Co., with moss on sandstone.
** E.G. Worthley Herbarium - Garrett Co., Casselman Bridge State Park, on sandstone rocks; Wicomico Co., on sandy soil.
* Peltigera didactyla (With.) J. R. Laundon [Peltigeraceae]
** Syn.: Peltigera spuria (Ach.) DC.
** Skorepa et al. (1977) – Washington Co., on rock in seepage area.
* Peltigera elisabethae Gyelnik [Peltigeraceae]
** Skorepa et al. (1977) – Baltimore Co., with moss on wet rocks.
* Peltigera evansiana Gyelnik [Peltigeraceae]
** Skorepa et al. (1977) – Baltimore Co., (collected by Plitt).
* Peltigera horizontalis (Hudson) Baumg. [Peltigeraceae]
** Skorepa et al. (1977) – Baltimore Co., (collected by Merrill 1906).
* Peltigera neckeri Müll. Arg. [Peltigeraceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Peltigera polydactylon (Necker) Hoffm. [Peltigeraceae]
** Skorepa et al. (1977) – Garrett Co., on moss covered rocks.
* Peltigera praetextata (Flörke ex Sommerf.) Zopf [Peltigeraceae]
** Skorepa et al. (1977) – Dorchester Co., at base of tree.
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (3. Chesapeake)
* Peltigera rufescens (Weiss) Humb. [Peltigeraceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Peltula euploca (Ach.) Poelt [Peltulaceae]
** Skorepa et al. (1979) – on soil.
* Pertusaria amara (Ach.) Nyl. [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
* Pertusaria epixantha R.C. Harris [Pertusariaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Pertusaria globularis (Ach.) Tuck. [Pertusariaceae]
** Skorepa et al. (1979) – on other.
* Pertusaria hypothamnolica Dibben [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
* Pertusaria macounii (Lamb) Dibben [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
* Pertusaria multipunctoides Dibben [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on trunk of Carya.
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Pertusaria ophthalmiza (Nyl.) Nyl. [Pertusariaceae]
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Pertusaria paratuberculifera Dibben [Pertusariaceae]
** Pertusaria tuberculifera Nyl is misidentification for N.A., most specimens are P. paratuberculifera.
** Skorepa et al. (1977) – Frederick Co., on oak trunks.
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (1. Millington), (2. Idylwild), (5. Hickory Pt.), (6. Pocomoke)
* Pertusaria plittiana Erichsen [Pertusariaceae]
** Skorepa et al. (1979) – on acidic rock.
* Pertusaria propinqua Müll. Arg. [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Pertusaria pustulata (Ach.) Duby [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
** E.C. Uebel Herbarium – Prince George's Co., on dead limb of deciduous tree.
** Lendemer & Knapp (2007) - (1. Millington)
* Pertusaria rubefacta Erichsen [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
* Pertusaria subpertusa Brodo [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (2. Idylwild), (6. Pocomoke)
* Pertusaria tetrathalamia (Fée) Nyl. [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
* Pertusaria texana Müll. Arg. [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Pertusaria trachythallina Erichsen [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
* Pertusaria velata (Turner) Nyl. [Pertusariaceae]
** Skorepa et al. (1977) – Frederick Co., in oak woods.
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (2. Idylwild), (5. Hickory Pt.), (6. Pocomoke)
* Pertusaria waghornei Hulting [Pertusariaceae]
** Skorepa et al. (1979) – on bark.
* Pertusaria xanthodes Müll. Arg. [Pertusariaceae]
** Skorepa et al. (1977) – Harford Co., on tree bark.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Calvert Co.; Frederick Co.; Washington Co., on bark of Quercus velutina.
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on bark of dead oak branch.
* Phaeocalicium curtisii (Tuck.) Tibell [Mycocaliciaceae]
** E.G. Worthley Herbarium - Baltimore Co., on twigs of Rhus glabra.
* Phaeocalicium polyporaeum (Nyl.) Tibell [Mycocaliciaceae]
** E.C. Uebel Herbarium – a specimen of Violet Toothed Polypore [Trichaptum biforme (Fries) Ryvarden] was collected with Flavoparmelia caperata (U-65) growing on the bark of a fallen oak tree at Liberty Reservoir in Baltimore County. The T. biforme had a stubble lichen growing on it which was identified by Dr. Steven Selva as Phaeocalicium polyporaeum.
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown), (6. Pocomoke)
* Phaeographis inusta (Ach.) Müll. Arg. [Graphidaceae]
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown)
* Phaeophyscia adiastola (Essl.) Essl. [Physciaceae]
** Syns.: Physcia orbicularis (Necker) Poetsch; Phaeophyscia orbicularis (Necker) Moberg
** Skorepa et al. (1977) – Allegany Co., on oak trunk.
** Skorepa et al. (1979) – on bark, acidic rock, other.
** E.G. Worthley Herbarium – Worcester Co., on bark of Taxodium; Frederick Co., Cunningham Falls; Baltimore Co., Church of the Brethren.
* Phaeophysica ciliata (Hoffm.) Moberg [Physciaceae]
** Syn.: Physcia ciliata (Hoffm.) Du Rietz
** Skorepa et al. (1977) – Caroline Co., on cement bridge.
** Skorepa et al. (1979) – on bark.
* Phaeophyscia hirsuta (Mereschk.) Essl. [Physciaceae]
** Syns.: Physcia hirsuta Mereschk., Phaeophyscia cernohorskyi (Nádv.) Essl.
** Skorepa et al. (1979) – on cement.
* Phaeophyscia hirtella Essl. [Physciaceae]
** Skorepa et al. (1979) – on bark.
* Phaeophyscia hispidula (Ach.) Essl. [Physciaceae]
** Syn.: Phaeophyscia imbricata Vainio
** Skorepa et al. (1979) – on bark.
* Phaeophyscia pusilloides (Zahlbr.) Essl. [Physciaceae]
** Syn.: Physcia pusilloides Zahlbr.
** Skorepa et al. (1977) – Frederick Co., on trees.
** Skorepa et al. (1979) – on bark.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight; Baltimore Co., on bark of Norway Maple;
* Phaeophyscia rubropulchra (Degel.) Essl. [Physciaceae]
** Syn.: Physcia orbicularis f. rubropulchra Degel.
** Skorepa et al. (1977) – Garrett Co., in upland woods.
** Skorepa et al. (1979) – on bark, acidic rock, other.
** Biechele (2002) – lower eastern shore of Maryland.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight; Baltimore Co., Liberty Reservoir, on trunk of Tulip tree.
** Lendemer & Knapp (2007) - (1. Millington), (2. Idylwild)
* Phlyctis ludoviciensis (Müll. Arg.) Lendemer [Phlyctidaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Physcia adscendens (Fr.) H. Olivier [Physciaceae]
** Skorepa et al. (1977) – Allegany Co., on deciduous trees.
** Skorepa et al. (1979) – on bark, calcareous rock.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., St. Thomas Cemetery, on gravestone.
* Physcia aipolia (Ehrh. ex Humb.) Fürnr. var. aipolia [Physciaceae]
** Skorepa et al. (1977) – Worcester Co., on deciduous trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Frederick Co., Cunningham Falls.
** E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir, on bark; Baltimore Co., on Norway Maple.
* Physcia americana G. Merr. [Physciaceae]
** Syn.: Physcia tribacoides Nyl.
** Skorepa et al. (1977) – Worcester Co., on deciduous trees.
** Skorepa et al. (1979) – on bark, acidic rock, calcareous rock.
** E.G. Worthley Herbarium - Baltimore Co., Grace Methodist Church, Gunpowder River, on Tulip Tree; Frederick Co., Cunningham Falls.
** Lendemer & Knapp (2007) - (2. Idylwild), (5. Hickory Pt.)
* Physcia millegrana Degel. [Physciaceae]
** Skorepa et al. (1977) – Garrett Co., on oak.
** Skorepa et al. (1979) – on bark, acidic rock.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Calvert Co.; Wicomico Co.; Carroll Co., Falls Realty Company, on cement steps.
** E.C. Uebel Herbarium – Prince Georges Co., on dead limb; Carroll Co., Liberty Reservoir, on bark.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Physcia phaea (Tuck.) J.W. Thomson [Physciaceae]
** Skorepa et al. (1977) – Baltimore Co., (collected by Plitt 1909)
** Skorepa et al. (1979) – on acidic rock.
* Physcia pseudospeciosa J.W. Thomson [Physciaceae]
** Skorepa et al. (1977) – Baltimore Co., on acid rocks.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Baltimore Co., near Gunpowder River, on vertical acidic rocks.
* Physcia pumilior R.C. Harris [Physciaceae]
** Lendemer & Knapp (2007) - (2. Idylwild)
* Physcia stellaris (L.) Nyl. [Physciaceae]
** Skorepa et al. (1977) – Baltimore Co., on oak.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple; Prince George's Co., on bark.
* Physcia subtilis Degel. [Physciaceae]
** Skorepa et al. (1977) – Montgomery Co., on rock ledges.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Frederick Co., Cunningham Falls.
* Physciella chloantha (Ach.) Essl. [Physciaceae]
** Syn.: Physcia luganensis Mereschk.
** Skorepa et al. (1977) – Queen Anne's Co., on cement bridge.
** Skorepa et al. (1979) – on bark, cement.
** E.C. Uebel Herbarium – Prince George's Co., along bike path, on concrete; on tree branch.
* Physconia detersa (Nyl.) Poelt [Physciaceae]
** Skorepa et al. (1979) – on bark, calcareous rock, cement.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Green Spring Valley, on brick wall; on old cement bridge.
* Placidium arboreum (Schwein. ex Michener) Lendemer [Verrucariaceae]
** Syn.: Dermatocarpon tuckermanii (Rav.) Zahlbr.; Placidium tuckermanii (Ravenel ex Mont.) Breuss
** Skorepa et al. (1977) – Allegany Co., base of White Oak.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Allegany Co., Green Ridge State Forest, on base of White Oak.
* Placidium lachneum (Ach.) Breuss [Verrucariaceae]
** E.G. Worthley Herbarium - Lichens of Soldiers Delight.
* Placynthiella uliginosa (Schrader) Coppins & P. James [Agyriaceae]
** Syn.: Lecidea uliginosa (Schrad.) Ach.
** Skorepa et al. (1977) – Dorchester Co., on oak trunk.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Placynthium nigrum (Hudson) Gray [Placynthiaceae]
** Skorepa et al. (1977) – Garrett Co., on block of cement.
** Skorepa et al. (1979) – on calcareous rock, cement.
** E.G. Worthley Herbarium - Baltimore Co., St. Thomas Church Cemetery, on rock wall.
* Platismatia tuckermanii (Oakes) Culb. & C. Culb. [Parmeliaceae]
** Skorepa et al. (1977) – Garrett Co., on sandstone boulder.
** Skorepa et al. (1979) – on bark, acidic rock, wood
* Polysporina simplex (Davies) Vezda [Acarosporaceae]
** Syn.: Sarcogyne simplex (Davies) Nyl.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Howard Co., on rock outcrop.
* Porina cestrensis (Tuck. ex Michener) Müll. Arg. [Trichotheliaceae]
** Skorepa et al. (1979) – on bark.
* Porina heterospora (Fink ex J. Hedrick) R.C. Harris [Trichotheliaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Porpidia albocaerulescens (Wulfen) Hertel & Knoph [Porpidiaceae]
** Syn.: Lecanora albocaerulescens (Wulf.) Ach.
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Baltimore Co., near small bridge, on Wissahickon schist; Frederick Co.; Garrett Co., on rocks along Big Run.
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on sandstone boulder.
* Porpidia crustulata? (Ach.) Hertel & Knoph [Porpidiaceae]
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
* Porpidia macrocarpa (DC.) Hertel & A. J. Schwab [Porpidiaceae]
** Syn.: Lecidea macrocarpa (DC.) Steud.
** Skorepa et al. (1977) – Garrett Co., on sandstone.
** Skorepa et al. (1979) – on acidic rock.
* Protoblastenia rupestris (Scop.) J. Steiner [Psoraceae]
** Skorepa et al. (1979) – on calcareous rock, cement.
* Pseudevernia consocians (Vainio) Hale & Culb. [Parmeliaceae]
** Syn.: Parmelia furfuracea (L.) Ach.
** Skorepa et al. (1977) – Garrett Co., on upper branches of Hemlock.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Baltimore Co., Owings Mills.
* Pseudosagedia cestrensis (Tuck. ex E. Michener) R.C. Harris [Porinaceae]
** Lendemer & Knapp (2007) - (2. Idylwild)
* Pseudosagedia raphidosperma (Müll. Arg.) R.C. Harris [Porinaceae]
** Lendemer & Knapp (2007) - (4. Sharptown)
* Psora decipiens (Hedwig) Hoffm. [Psoraceae]
** Syn.: Lecidea decipiens (Hedwig) Ach.
** Skorepa et al. (1979) – on soil.
* Psora russellii (Tuck.) A. Schneider [Psoraceae]
** Syn.: Lecidea russellii Tuck.
** Skorepa et al. (1977) – Frederick Co., on conglomerate boulders.
** Skorepa et al. (1979) – on calcareous rock.
* Psorotichia schaereri (A. Massal.) Arnold [Lichinaceae]
** Skorepa et al. (1979) – on cement.
* Psorula rufonigra (Tuck.) Gotth. Schneider [Psoraceae]
** Syn.: Lecidea rufonigra (Tuck.) Nyl.
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Skorepa et al. (1979) – on acidic rock.
* Punctelia appalachensis (Culb.) Krog [Parmeliaceae]
** Syn.: Parmelia appalachensis Culb.
** Skorepa et al. (1979) – on bark.
* Punctelia bolliana (Müll. Arg.) Krog [Parmeliaceae]
** Syn.: Parmelia bolliana Müll. Arg.
** Skorepa et al. (1979) – on bark.
* Punctelia borreri (Sm.) Krog [Parmeliaceae]
** Syn.: Parmelia borreri (Sm.) Turner
** Skorepa et al. (1979) – on bark.
* Punctelia missouriensis G. Wilh. & Ladd
** Lendemer & Knapp (2007) - (2. Idylwild)
* Punctelia perreticulata (Räsänen) G. Wilh. & Ladd [Parmeliacae]
** Syns.: Punctelia subrudecta (Nyl.) Krog, Parmelia subrudecta Nyl.
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Skorepa et al. (1979) – on bark, acidic rock.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Owings Mills, on bark.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight; Baltimore Co., on bark of Norway Maple.
** Lendemer & Knapp (2007) - (4. Sharptown)
* Punctelia rudecta (Ach.) Krog [Parmeliaceae]
** Syn.: Parmelia rudecta Ach.
** Skorepa et al. (1977) – Caroline Co., on trunks of trees.
** Skorepa et al. (1979) – on bark, acidic rock.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Ivy Mill Road, on bark; Calvert Co.; Wicomico Co.; Carroll Co., on bark of Tulip Tree.
** E.C. Uebel Herbarium – Prince George's Co., on dead limb; Carroll Co., Liberty Reservoir, on bark.
** Lendemer & Knapp (2007) - (1. Millington), (5. Hickory Pt.), (6. Pocomoke)
* Pycnothelia papillaria Dufour [Cladoniaceae]
** Skorepa et al. (1977) – Prince George's Co., along dirt road.
** Skorepa et al. (1979) – on soil.
** Biechele (2002) – lower eastern shore of Maryland.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
* Pyrenula pseudobufonia (Rehm) R.C. Harris [Pyrenulaceae]
** Syn.: Pyrenula neglecta R.C. Harris
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (2. Idylwild), (5. Hickory Pt.)
* Pyrenula punctella Trevis. [Pyrenulaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Pyrenula subelliptica (Tuck.) R.C. Harris [Pyrenulaceae]
** Syn.: Pyrenula imperfecta (Ellis & Everh.) R.C. Harris
** Skorepa et al. (1979) – on bark.
* Pyrrhospora varians (Ach.) R.C. Harris [Lecanoraceae]
** Syn.: Lecidea varians Ach.
** Skorepa et al. (1977) – Worcester Co., on twigs of Myrica.
** Skorepa et al. (1979) – on bark.
** Lendemer & Knapp (2007) - (2. Idylwild), (5. Hickory Pt.), (6. Pocomoke)
* Pyxine caesiopruinosa (Tuck.) Imshaug [Physciaceae]
** Skorepa et al. (1977) – Howard Co., on tree.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Baltimore Co., on bark of Juglans nigra; Carroll Co., on bark of Juglans nigra.
* Pyxine sorediata (Ach.) Mont. [Physciaceae]
** Skorepa et al. (1977) – Garrett Co., on oak.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium – Frederick Co.; Baltimore Co., growing on a sterile crust, Pertusaria?
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on tree root; Ridge Road, on bark Norway Maple.
** Lendemer & Knapp (2007) - (1. Millington), (2. Idylwild), (4. Sharptown)
* Pyxine subcinerea Stirton [Physciaceae]
** E.C. Uebel Herbarium – Prince George's Co., on oak bark; Baltimore Co., on maple bark.
* Ramalina americana? Hale [Ramalinaceae]
** Biechele (2002) – lower eastern shore of Maryland.
* Ramalina fastigiata (Pers.) Ach. [Ramalinaceae]
** Skorepa et al. (1977) – Worcester Co., on branches of deciduous trees.
** Skorepa et al. (1979) – on bark.
* Ramalina willeyi R. Howe [Ramalinaceae]
** Skorepa et al. (1977) – Worcester Co., on branches of deciduous trees.
** Biechele (2002) – lower eastern shore of Maryland.
* Ramonia microspora Vězda [Gyalectaceae]
** Lendemer & Knapp (2007) - (2. Idylwild)
* Rhizocarpon concentricum (Davies) Beltr. [Rhizocarpaceae]
** E.G. Worthley Herbarium - Garrett Co., Swallow Falls State Forest, on sandstone.
* Rhizocarpon eupetraeum (Nyl.) Arnold [Rhizocarpaceae]
** Syn.: Rhizocarpon intermedium Degel.
** Skorepa et al. (1979) – on acidic rock.
* Rhizocarpon geographicum (L.) DC. [Rhizocarpaceae]
** Skorepa et al. (1979) – on acidic rock.
* Rhizocarpon obscuratum (Ach.) A. Massal. [Rhizocarpaceae]
** Skorepa et al. (1977) – Baltimore Co., on rock outcrop.
** Skorepa et al. (1979) – on acidic rock.
* Rhizoplaca chrysoleuca (Sm.) Zopf [Lecanoraceae]
** Syn.: Lecanora rubina (Vill.) Ach.; Lecanora chrysoleuca (Sm.) Ach.
** Skorepa et al. (1977) – Montgomery Co., on rock ledges.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Frederick Co., Mt. Catoctin Park; Montgomery Co., Great Falls, on rocks.
* Rimelia subisidiosa (Müll. Arg.) Hale & Fletcher [Parmeliaceae]
** Syn.: Parmelia subisidiosa (Müll. Arg.) C.W. Dodge
** Skorepa et al. (1979) – on bark.
* Rinodina applanata H. Magn. [Physciaceae]
** Skorepa et al. (1979) – on bark.
* Rinodina ascociscana Tuck. [Physciaceae]
** Skorepa et al. (1979) – on bark.
* Rinodina exigua (Ach.) Gray [Physciaceae]
** Skorepa et al. (1979) – on bark.
* Rinodina ochrocea Willey ex Fink [Physciaceae]
** Skorepa et al. (1979) – on acidic rock.
* Rinodina oxydata (A. Massal.) A. Massal. [Physciaceae]
** Skorepa et al. (1979) – on acidic rock.
* Rinodina papillata H. Magn. [Physciaceae]
** Skorepa et al. (1979) – on bark.
* Rinodina subminutaH. Magn. [Physciaceae]
** Skorepa et al. (1979) – on bark.
* Sarcogyne clavus (DC.) Kremp. [Acarosporaceae]
** Skorepa et al. (1979) – on acidic rock.
* Sarcogyne regularis Körber [Acarosporaceae]
** Skorepa et al. (1979) – on calcareous rock.
** E.C. Uebel Herbarium – Prince George's Co., Greenbelt, on hill of concrete.
* Sarcosagium campestre (Fr.) Poetsch & Schiedem. [Acarosporaceae]
** Syn.: Biatorella campestris (Fr.) Almq.
** Skorepa et al. (1979) – on soil.
* Schismatomma glaucescens (Nyl. ex Willey) R.C. Harris [Roccellaceae]
** Lendemer & Knapp (2007) - (4. Sharptown)
* Scoliciosporum chlorococcum (Stenh.) Vezda [Lecanoraceae]
** Syn.: Bacidia chlorococca (Graeve ex Stizenb.) Lett.
** Skorepa et al. (1977) – Montgomery Co., on oak.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Worcester Co., Milburn Landing.
** E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on bark of Acer rubrum.
** Lendemer & Knapp (2007) - (2. Idylwild)
* Scoliciosporum umbrinum (Ach.) Arnold [Lecanoraceae]
** Syn.: Bacidia umbrina (Ach.) Bausch
** Skorepa et al. (1977) – Garrett Co., on aspens.
** Skorepa et al. (1979) – on acid rock.
* Sphinctrina turbinata (Pers ex Fr.) de Not. [Sphinctrinaceae]
** E.C. Uebel Herbarium – Carroll Co., Liberty Reservoir, on Aspicilia caesiocinerea.
* Sticta fuliginosa (Hoffm.) Ach. [Lobariaceae]
** E.G. Worthley Herbarium - Frederick Co., along Appalachian Trail, on soil.
* Teloschistes chrysophthalmus (L.) Th. Fr. [Teloschistaceae]
** Skorepa et al. (1979) – on bark.
* Tephromela atra (Huds.) Hafellner [Bacidiaceae]
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Thelidium minutulum Körber [Verrucariaceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.)
* Thelotrema monospermum R.C. Harris [Thelotremataceae]
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Thelotrema subtile Tuck. [Thelotremataceae]
** Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke)
* Trapelia coarctata (Sm.) M. Choisy [Agyriaceae]
** Syn.: Lecidea coarctata (Sm.) Nyl.
** Skorepa et al. (1979) – on acidic rock.
* Trapeliopsis flexuosa (Fr.) Coppins & P. James [Agyriaceae]
** Syn.: Lecidea aeruginosa Borrer
** Skorepa et al. (1977) – Harford Co., on fence post.
** Skorepa et al. (1979) – on wood.
** E.C. Uebel Herbarium – Prince George's Co., NE Branch of Anacostia River Bike Trail, on weathered fence rail.
** Lendemer & Knapp (2007) - (2. Idylwild), (3. Chesapeake)
* Trapeliopsis granulosa (Hoffm.) Lumbsch [Agyriaceae]
** Syn.: Lecidea granulosa (Hoffm.) Ach.
** Skorepa et al. (1979) – on soil.
** E.G. Worthley Herbarium - Montgomery Co., Great Falls, on timber.
* Trypethelium virens Tuck. ex Michener [Trypetheliaceae]
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Calvert Co., on bark.
** Lendemer & Knapp (2007) - (4. Sharptown), (5. Hickory Pt.)
* Tuckermanella fendleri (Nyl.) Essl. [Parmeliaceae]
** Syn.: Cetraria fendleri (Nyl.) Tuck.; Tuckermannopsis fendleri (Nyl.) Hale
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Wicomico Co., Wicomico State Park; on Loblolly Pine; Worcester Co., Milburn Landing, on bark of Loblolly Pines.
* Tuckermannopsis americana (Sprengel) Hale [Parmeliaceae]
** Lendemer & Knapp (2007) - (4. Sharptown)
* Tuckermannopsis ciliaris (Ach.) Gyelnik [Parmeliaceae]
** Syn.: Cetraria ciliaris Ach.
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Skorepa et al. (1979) – on bark.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Wicomico Co., on bark.
* Umbilicaria mammulata (Ach.) Tuck. [Umbilicariaceae]
** Syn.: Gyrophora dillenii (Tuck.) Müll.
** Skorepa et al. (1977) – Garrett Co., on conglomerate.
** Skorepa et al. (1979) – on bark, acidic rock.
** E.G. Worthley Herbarium - Baltimore Co., Loch Raven, on rock outcrop; Frederick Co., South Mt., on boulders; Montgomery Co., Sugarloaf Mt., on boulders.
* Umbilicaria muehlenbergii (Ach.) Tuck. [Umbilicariaceae]
** Skorepa et al. (1977) – Allegany Co., on rock outcrop.
** Skorepa et al. (1979) – on acidic rock.
* Umbilicaria vellea (L.) Hoffm. [Umbilicariaceae]
** Skorepa et al. (1977) – No locality. (collected by Plitt 1912)
** Skorepa et al. (1979) – on acidic rock.
* Usnea filipendula Stirton [Parmeliaceae]
** Syn.: Usnea dasypoga (Ach.) Rohl.
** Skorepa et al. (1977) – Garrett Co., (collected by Smith).
** Skorepa et al. (1979) – on bark.
* Usnea mutabilis Stirton [Parmeliaceae]
** Skorepa et al. (1977) – Worcester Co., on pines.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium - Worcester Co., Pocomoke State Park, on Taxodium distichum.
* Usnea pensylvanica Motyka [Parmeliaceae]
** Lendemer & Knapp (2007) - (2. Idylwild), (6. Pocomoke)
* Usnea strigosa (Ach.) Eaton [Parmeliaceae]
** Skorepa et al. (1977) – Worcester Co., on deciduous trees.
** Biechele (2002) – lower eastern shore of Maryland.
** E.G. Worthley Herbarium – Worcester Co.; Calvert Co, Battle Creek Cypress Swamp; St. Mary's Co.; Wicomico Co.
** E.C. Uebel Herbarium – Baltimore Co., Ridge Rd., on bark of Norway Maple.
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Usnea strigosa subsp. rubiginea (Michaux) I. Tav. [Parmeliaceae]
** Syn.: Usnea rubiginea (Michx.) Massal.
** Skorepa et al. (1977) – Worcester Co., on deciduous trees.
** Skorepa et al. (1979) – on bark.
* Usnea subscabrosa Nyl. ex Motyka [Parmeliaceae]
** Lendemer & Knapp (2007) - (2. Idylwild), (4. Sharptown), (5. Hickory Pt.), (6. Pocomoke)
* Usnea trichodea Ach. [Parmeliaceae]
** Skorepa et al. (1977) – Worcester Co., on tops of Cypress trees.
** Skorepa et al. (1979) – on bark.
** Biechele (2002) – lower eastern shore of Maryland.
** Lendemer & Knapp (2007) - (6. Pocomoke)
* Verrucaria calciseda DC. [Verrucariaceae]
** Skorepa et al. (1979) – on calcareous rock.
* Verrucaria fuscella (Turner) Winch [Verrucariaceae]
** Skorepa et al. (1979) – on calcareous rock.
* Verrucaria glaucovirens Grummann [Verrucariaceae]
** Syn.: Verrucaria virens Nyl.
** Skorepa et al. (1979) – on calcareous rock.
* Verrucaria muralis Ach. [Verrucariaceae]
** Skorepa et al. (1979) – on calcareous rock.
* Verrucaria nigrescens Pers. [Verrucariaceae]
** Skorepa et al. (1977) – Lichens of Soldiers Delight.
** Skorepa et al. (1979) – on calcareous rock.
* Verrucaria pinguicula A. Massal. [Verrucariaceae]
** Skorepa et al. (1979) – on calcareous rock.
* Xanthomendoza fallax (Hepp) Søchting, Kärnefelt & S. Kondr. [Teloschistaceae]
** Syn.: Xanthoria fallax (Hepp) Arn.
** Skorepa et al. (1977) – Worcester Co., on deciduous trees.
** Skorepa et al. (1979) – on bark, cement.
** Biechele (2002) – lower eastern shore of Maryland.
* Xanthomendoza fulva (Hoffm.) Søchting, Kärnefelt & S. Kondr. [Teloschistaceae]
** Syn.: Xanthoria fulva (Hoffm.) Poelt & Petutschnig
** E.C. Uebel Herbarium – Baltimore Co., Ridge Rd., on bark of Norway Maple.
* Xanthoparmelia angustiphylla (Gyelnik) Hale [Parmeliaceae]
** Syn.: Parmelia hypopsila Müll. Arg. = Xanthoparmelia hypopsila, but N.A. records are Xanthoparmelia angustiphylla.
** Skorepa et al. (1977) – Baltimore Co., on rock outcrop.
** Skorepa et al. (1979) – on acidic rock.
* Xanthoparmelia conspersa (Ehrh. ex Ach.) Hale [Parmeliaceae]
** Syn.: Parmelia conspersa (Ach.) Ach.
** Skorepa et al. (1977) – Garrett Co., on rock outcrop.
** Skorepa et al. (1979) – on acidic rock.
** E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Gunpowder River, on rock outcrops; Frederick Co.
* Xanthoparmelia cumberlandia (Gyelnik) Hale [Parmeliaceae]
** Syn.: Parmelia cumberlandia (Gyelnik) Hale
** Skorepa et al. (1977) – Baltimore Co., on rocks on hillside.
** Skorepa et al. (1979) – on acidic rock.
* Xanthoparmelia plittii (Gyelnk) Hale [Parmeliaceae]
** Syn.: Parmelia plittii Gyelnik
** Skorepa et al. (1977) – Washington Co., on rock outcrops.
** Skorepa et al. (1979) – on acidic rock.
** E.C. Uebel Herbarium – Lichens of Soldiers Delight.
* Xanthoparmelia subramigera (Gyelnik) Hale [Parmeliaceae]
** E.C. Uebel Herbarium – Prince George's Co., Berwyn Heights, on roof shingles (identified by Dr. Richard C. Harris).
* Xanthoparmelia tasmanica (Hook. f. & Taylor) Hale [Parmeliaceae]
** Syn.: Parmelia tasmanica Hook. f. & Taylor
** Skorepa et al. (1979) – on acidic rock.
* Xanthoparmelia viriduloumbrina (Gyelnik) Lendemer [Parmeliaceae]
** Syn: Parmelia taractica Kremplh. = Xanthoparmelia taractica (Kremp.) Hale – known from Mexico, but misidentifications for our area; specimens in eastern N.A. are X. viriduloumbrina.
** Skorepa et al. (1977) (Parmelia taractica) – Baltimore Co., on serpentine rocks.
** Skorepa et al. (1979) (Parmelia taractica) – on acidic rock.
** E.G. Worthley Herbarium (Parmelia taractica); Allegany Co. (Parmelia taractica), Green Ridge State Forest, on red shale; Carroll Co. (Parmelia taractica), Church of the Brethren, on stone wall.
* Xanthoria parietina? (L.) Th. Fr. [Teloschistaceae]
** Biechele (2002) – lower eastern shore of Maryland.