Report of the Nomenclature Committee for Fungi: 20
Authors: May Tom W. 
Published: May 2017

SummaryRatification of appointment of repositories by the International Mycological Congress is reported. The following two family names are recommended for conservation: Chrysotrichaceae against Pulverariaceae; and the teleomorph‐typified Erysiphaceae against the anamorph‐typified Oidiaceae. The following family name is not recommended for conservation: Dothioraceae against Saccotheciaceae. The following 10 generic names are recommended for conservation: the teleomorph‐typified name Blumeria against the conserved anamorph‐typified name Oidium; Catenaria Sorokïn (Fungi) against Catenaria Roussel (Algae); Chrysothrix, nom. cons., against an additional name, Alysphaeria; Flammula (Fr. : Fr.) P. Kumm. (Fungi) against Flammula (Webb ex Spach) Fourr. (Spermatophyta) with a conserved type; Fuscopannaria against Moelleropsis; Geastrum with a conserved type; Hebeloma with a conserved type; Polycaryum with that spelling; Pseudocyphellaria with a conserved type; and Talaromyces against Lasioderma. Conservation of Detonia Freng. (Algae) against Detonia Sacc. (Fungi) is not opposed. The following generic name is not recommended for conservation: Catillaria with a conserved type. The proposal to conserve the generic name Wickerhamomyces against Hansenula was withdrawn. The following 17 species names are recommended for conservation: Agaricus laterinus (Hebeloma laterinum) against the sanctioned A. fastibilis (H. fasti‐bile); Agaricus tabescens against A. socialis; Alectoria fuscescens (Bryoria fuscescens) against Lichen chalybeiformis and A. subcana; Armillariella ostoyae (Armillaria ostoyae) against Agaricus obscurus, A. occultans, and Armillaria solidipes; Ganoderma camphoratum with a conserved type; Hebeloma fragilipes against Hebelomina domardiana (Hebeloma domardianum); Helminthosporium maydis Y. Nisik. & C. Miyake (Bipolaris maydis) againstH. maydis Brond. and Ophiobolus heterostrophus; Lecidea oederi (Rhizocarpon oederi) against L. koenigii; Lichen fuscatus Schrad. (Acarospora fuscata) against L. fuscatus Lam. with a conserved type; Lichen leucomelos (Heterodermia leucomelos) with that spelling; Lichen muralis (Lecanora muralis, Protoparmeliopsis muralis) with a conserved type; Lichen vulgatus (Opegrapha vulgata) with a conserved type; Morchella semilibera against Phallus crassipes, P. gigas and P. undosus; Peziza ammophila Durieu & Lev. against P. ammophila Saut.; Polycaryum branchipodianum with that spelling; Stereocaulon pileatum with a conserved type; and Torula stilbospora with a conserved type. The following 22 species names (teleomorph‐typified) are recommended for conservation against anamorph‐typified names: Erysiphe arcuata against Oidium carpini; Erisyphe biocellata against Oidium erysiphoides; Erysiphe buhrii against Oidium dianthi; Erysiphe catalpae against Oidium bignoniae; Erysiphe celosiae against Oidium amaranthi; Erisyphe magnicellulata against O. drummondii; Erysiphe quercicola against Oidium anacardii; Erisyphe verbasci against Oidium balsamii; Golovinomyces sonchicola against Oidium sonchi‐arvensis; Leveillula rutae against Oidium haplophylli; Microsphaera azaleae against O. ericinum; Microsphaera oehrensii against Oidium robustum; Phyllactinia alni against Ovulariopsis alni‐formosanae; Phyllactinia ampelopsidis against Ovulariopsis ampelopsidis‐heterophyllae; Phyllactinia chubutiana against Oidium insolitum; Phyllactinia dalbergiae against P. subspiralis; Phyllactiniagmelinae against Ovulariopsisgmelinae‐arboreae; Phyllactiniapopuli against Ovulariopsis salicis‐warburgii; Podosphaera solanacearum against Oidium saeforthiani; Sphaerotheca euphorbiae‐hirtae against Oidium pedilanthi; Sphaerotheca filipendulae against Torula botryoides; and Sphaerotheca leucotricha against Oidium farinosum. The following two species names are not recommended for conservation: Cylindrocladium buxicola against C. pseudonaviculatum; and Verrucaria subcerasi (Arthopyrenia subcerasi) against A. subalbicans. It is recommended that the generic name Aspidelia and the species name Lichen quis‐quiliaris not be rejected under Art. 56. The following two species names are recommended for rejection under Art. 56: Botrytis farinosa (Peronospora farinosa) and Saccharomyces sphaericus. As a result of reference under Art. 53.5, it is recommended that the following two pairs of names are not to be treated as homonyms: Bertia De Not. and Bertya Planch.; and Otidea (Pers.) Bonord. and Otidia Sweet.