| Name | Phaeotrema pachystomum (Nylander) Zahlbruckner | 
| Authorship | (Nylander) Zahlbruckner | 
| Rank | Species | 
| Placed in | Phaeotrema Müller Argoviensis | 
| GUID | urn:lsid:indexfungorum.org:names:400311 | 
| Citation | 1923 Cat. Lich. Univ. 2: 609 | 
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Phaeotrema pachystomum (Nylander) Zahlbruckner | 
| Identification made in | [no date] (1) |