| Name | Parmelia diffusa (Weber) Rebentisch | 
| Authorship | (Weber) Rebentisch | 
| Rank | Species | 
| Placed in | Parmelia Acharius | 
| Citation | 1804 Prodr. Fl. Neomarch. 301 | 
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Parmelia diffusa (Weber) Rebentisch | 
| Identification made in | [no date] (2) | 
