| Name | Physcia callosa Nylander |
| Authorship | Nylander |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Physcia (Schreber) Michaux |
| GUID | urn:lsid:indexfungorum.org:names:400583 |
| Citation | 1869 Flora 52: 119 |
| Holdings | 38 Specimens held in the Harvard University Herbaria identified as Physcia callosa Nylander |
| Identification made in | [no date] (9), 1953 (4), 1956 (10), 1957 (14), 2010 (1) |
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