| Name | Microcystis firma (Brébisson & Lenormand) Schmidle |
| Authorship | (Brébisson & Lenormand) Schmidle |
| Rank | Species |
| Placed in | Microcystis Lemmermann |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Microcystis firma (Brébisson & Lenormand) Schmidle |
| Identification made in | [no date] (1) |