| Name | Philonotis longiseta var. porteri (Austin) Flowers |
| Authorship | (Austin) Flowers |
| Rank | Variety |
| Placed in | Philonotis longiseta (Michaux) E. Britton |
| Citation | 1935 Moss Fl. N. Amer. 2: 171 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Philonotis longiseta var. porteri (Austin) Flowers |
| Identification made in | [no date] (1) |
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