Name:		Pterygium Nyl., Bulletin. Société Botanique de France 1 (1854) page 328 [basionym]
Accepted name:		Placynthium (Ach.) Gray
Status:		Genus, lichen-forming
Taxonomic position:		Placynthiaceae Å.E. Dahl [Family] Peltigerales Walt. Waton [Order] Lecanoromycetidae P.M. Kirk, P.F. Cannon, J.C. David & Stalpers ex Miądl., Lutzoni & Lumbsch [Subclass] Lecanoromycetes O.E. Erikss. & Winka [Class] Pezizomycotina O.E. Erikss. & Winka [Subdivision / Subphylum] Ascomycota Caval.-Sm. [Division / Phylum] Fungi R.T. Moore [Kingdom]
Constituent taxa:		Species Pterygium adglutinatum (Anzi) Nyl. Pterygium asperellum (Ach.) Nyl. Pterygium baumgartneri Zahlbr. Pterygium centrifugum Nyl. Pterygium coerulescens Harm. Pterygium conferciens Nyl. Pterygium controversum Pterygium diffractum (Kremp. ex Körb.) Couderc Pterygium filiforme (Garov.) A.L. Sm. Pterygium kenmorense (H.B. Holl ex Nyl.) A.L. Sm. Pterygium lismorense Nyl. ex Cromb. Pterygium pannariellum Nyl. Pterygium petersii Nyl. Pterygium posterulum Nyl. Pterygium setubalense Nyl. Pterygium subradiatum (Nyl.) Nyl. Pterygium tremniacum (A. Massal.) Nyl. Pterygium triptophyllizum (Nyl.) Hue Pterygium zeylanense Leight.
Cybertruffle Resources:		Cyberliber Cumulative Index
Links:		Fungal Databases [Systematic Botany and Mycology, USDA] Genbank Google images IMI [CABI Fungus Dried Reference Collection] Index Fungorum Landcare [New Zealand] Mycobank New York Botanic Garden [Virtual Fungus Dried Reference Collection]