| Name | Fucus vesiculosus f. gracillimus Collins |
| Authorship | Collins |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Fucus vesiculosus Linnaeus |
| Citation | 1900 Rhodora 2: 14 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Fucus vesiculosus f. gracillimus Collins |
| Identification made in | [no date] (2) |
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