| Name | Cercospora extremorum Sydow & P. Sydow |
| Authorship | Sydow & P. Sydow |
| Rank | Species |
| Placed in | Cercospora |
| Citation | 1917 Ann. Mycol. 15 (3/4): 264 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Cercospora extremorum Sydow & P. Sydow |
| Identification made in | [no date] (2) |