| Name | Batrachospermum vagum f. tenuissimum Collins |
| Authorship | Collins |
| Rank | Forma |
| Placed in | Batrachospermum vagum (Roth) C. Agardh |
| Citation | 1902 Phycoth. Bor.-Amer. 990 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Batrachospermum vagum f. tenuissimum Collins |
| Identification made in | [no date] (1) |
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