| Name | Usnea longissima var. corticata Howe |
| Authorship | Howe |
| Rank | Variety |
| Placed in | Usnea longissima Acharius |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Usnea longissima var. corticata Howe |
| Identification made in | [no date] (2) |
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