| Name | Polysiphonia nigrescens var. affinis (Moore) Harvey |
| Authorship | (Moore) Harvey |
| Rank | Variety |
| Placed in | Polysiphonia nigrescens (Hudson) Greville ex Harvey |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Polysiphonia nigrescens var. affinis (Moore) Harvey |
| Identification made in | [no date] (2) |
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