Malmidea tratiana Kalb &amp; Mongkolsuk 2012, sp. nov.
Creators: name: Kalb, Klaus
name: Buaruang, Kawinnat
name: Mongkolsuk, Pachara
name: Boonpragob, Kansri
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Fungi
Ascomycota
Lecanoromycetes
Lecanorales
Malmideaceae
Malmidea
Malmidea tratiana

description: <i>Malmidea tratiana</i> Kalb &amp; Mongkolsuk <i>sp. nov.</i> (Fig. 2I) Mycobank MB 564184 <i>Sicut Malmidea furfurosa (Tuck. ex Nyl.) Kalb &amp; Lücking sed thallo leve et sporis minoribus differt.</i> <b>Type</b>:— THAILAND. Trat Province: Muang District, near Ban Nam Chieo, in a ± disturbed mangrove forest on <i>Rhizophora apiculata</i>, ± 3 m, 12°10’25’’ N, 102°28’37’’ E, 25 February 2011, K. Kalb &amp; P. Mongkolsuk (holotype RAMK, isotype hb. Kalb 38852). <b>Etymology</b>:—This species is named after the type locality in Trat Province. Thallus crustose, corticolous, continuous, 150–250 µm thick, ± smooth or slightly bullate, green to greengrey, phenocortex ca. 10–15 µm thick with small crystals, algal layer 80–100 µm thick, medulla indistinct, ca. 60–150 µm thick, prothallus whitish, soralia and isidia absent. Photobiont chlorococcoid, cells 7–10 µm diam. Apothecia sessile, round, 0.3–0.5 mm diam. and 0.25–0.35 µm high; disc plane to slightly concave, pale leather brown to grey-brown; margin of <i>piperis</i> - type (Kalb <i>et al.</i> 2011), thick, prominent, black. Thalline exciple absent, proper exciple dark brown internally, outer part ± hyaline, 45–100 µ m wide without hydrophobic granules, KOH-. Hypothecium 70–100 µm high, blackish brown, KOH-. Epihymenium hyaline. Hymenium 70–80 µm high, hyaline. Asci 60–70 × 15–18 µm, 6–8 spored. Ascospores non-septate, wall uniformly thickened, halonate, ellipsoid to fusiform, 9–11 × 5–6 µm, halo 1 µm thick. Pycnidia not observed. Chemistry: an unknown spot with R f values 37, 9, 23 in solvents A, B’, C (Elix &amp; Ernst-Russell 1993). <b>Notes</b>:— <i>Malmidea</i> species with a <i>piperis</i> - type exciple are rare in the tropics but more abundant in subtropical regions or at higher elevations. On the other hand, species with a <i>granifera</i> - type exciple are more common in the tropics or at lower elevation. Kalb <i>et al.</i> (2011) mention only one species (<i>Malmidea perplexa</i> Kalb) with a <i>piperis</i> - type exciple for Thailand. <i>Malmidea tratiana</i> is readily distinguished from that species by its dark brown hypothecium (hyaline in <i>M. perplexa</i>) and the black margin of the apothecia (whitish grey to dark brownish grey in <i>M. perplexa</i>). <i>Malmidea tratiana</i> differs from the neotropical <i>M. furfurosa</i> (Tuck. ex Nyl.) Kalb &amp; Lücking by the ± smooth thallus (granular to isidiose in <i>M. furfurosa</i>) and smaller ascospores (9–11 × 5–6 µm versus 11–14 × 5–7.5 µm). Furthermore, no secondary lichen products could be detected in <i>M. furfurosa</i> by means of TLC.
description: Published as part of <i>Kalb, Klaus, Buaruang, Kawinnat, Mongkolsuk, Pachara &amp; Boonpragob, Kansri, 2012, New or otherwise interesting Lichens. VI, including a lichenicolous fungus, pp. 35-47 in Phytotaxa 42</i> on page 44, DOI: 10.11646/phytotaxa.42.1.5, http://zenodo.org/record/4894823
description: {"references": ["Kalb, K., Rivas Plata, E., Lucking, R. &amp; Lumbsch, H. T. (2011) The phylogenetic position of Malmidea, a new genus for the Lecidea piperis - and Lecanora granifera - groups (Lecanorales, Malmideaceae), inferred from nuclear and mitochondrial ribosomal DNA sequences, with special reference to Thai species. Bibliotheca Lichenologica 106: 143 - 168."]}