| Name | Arthonia diffusa Nylander |
| Authorship | Nylander |
| Rank | Species |
| Placed in | Arthonia Acharius |
| GUID | urn:lsid:indexfungorum.org:names:376456 |
| Citation | 1885 Flora 68: 448 |
| Holdings | 15 Specimens held in the Harvard University Herbaria identified as Arthonia diffusa Nylander |
| Identification made in | [no date] (15) |
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