| Name | Cosmarium porteanum var. majus A. M. Scott & Prescott |
| Authorship | A. M. Scott & Prescott |
| Rank | Variety |
| NomenclaturalStatus | LaterHomonym |
| Placed in | Cosmarium porteanum W. Archer |
| Citation | 1961 Hydrobiologia 17(1//2): 65 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cosmarium porteanum var. majus A. M. Scott & Prescott |
| Identification made in | [no date] (1) |
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