| Name | Physcia obscura var. ulothrix (Acharius) Crombie |
| Authorship | (Acharius) Crombie |
| Rank | Variety |
| Placed in | Physcia obscura (Ehrhart) Hampe ex Fürnrohr |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Physcia obscura var. ulothrix (Acharius) Crombie |
| Identification made in | [no date] (2) |
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