| Name | Phormidium subfuscum Kützing ex Gomont |
| Authorship | Kützing ex Gomont |
| Rank | Species |
| Placed in | Phormidium Kützing ex Gomont |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Phormidium subfuscum Kützing ex Gomont |
| Identification made in | [no date] (2), 1936 (2) |
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