| Name | Phormidium ambiguum Gomont |
| Authorship | Gomont |
| Rank | Species |
| Placed in | Phormidium Kützing ex Gomont |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Phormidium ambiguum Gomont |
| Identification made in | [no date] (1) |
| Name | Phormidium ambiguum Gomont |
| Authorship | Gomont |
| Rank | Species |
| Placed in | Phormidium Kützing ex Gomont |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Phormidium ambiguum Gomont |
| Identification made in | [no date] (1) |