| Name | Polysiphonia parasitica f. borealis Collins |
| Authorship | Collins |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Polysiphonia parasitica (Hudson) Greville |
| Citation | 1913 Bull. Geol. Surv. Victoria Mem. Mus. 1: 121 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Polysiphonia parasitica f. borealis Collins |
| Identification made in | [no date] (1) |
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