| Name | Arthonia diffusella Fink |
| Authorship | Fink |
| Rank | Species |
| Placed in | Arthonia Acharius |
| Citation | 1934 Mycologia 25(4): 310 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Arthonia diffusella Fink |
| Identification made in | [no date] (4) |
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