| Name | Fucus membranaceus f. acuminatus Gardner |
| Authorship | Gardner |
| Rank | Forma |
| Placed in | Fucus membranaceus Stackhouse |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Fucus membranaceus f. acuminatus Gardner |
| Identification made in | [no date] (1) |
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