| Name | Phormidium retzii Gomont |
| Authorship | Gomont |
| Rank | Species |
| Placed in | Phormidium Kützing ex Gomont |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Phormidium retzii Gomont |
| Identification made in | [no date] (3) |
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