| Name | Arthonia subdiffusa Willey |
| Authorship | Willey |
| Rank | Species |
| Placed in | Arthonia Acharius |
| GUID | urn:lsid:indexfungorum.org:names:376850 |
| Holdings | 17 Specimens held in the Harvard University Herbaria identified as Arthonia subdiffusa Willey |
| Identification made in | [no date] (14), 2016 (1), 2019 (2) |
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