| Name | Usnea barbata f. florida (Linnaeus) Rabenhorst |
| Authorship | (Linnaeus) Rabenhorst |
| Rank | Forma |
| Placed in | Usnea barbata (Linnaeus f.) Weber ex F. H. Wiggers |
| Citation | 1845 Deutschl. Krypt.-Fl. 2: 120 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Usnea barbata f. florida (Linnaeus) Rabenhorst |
| Identification made in | [no date] (2) |
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