| Name | Parmotrema subrigidum Egan | 
| Authorship | Egan | 
| Rank | Species | 
| Placed in | Parmotrema A. Massalongo | 
| GUID | urn:lsid:indexfungorum.org:names:357169 | 
| Citation | 2005 Bryologist 108(3): 404 | 
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Parmotrema subrigidum Egan | 
| Identification made in | [no date] (5), 2018 (2) |