| Name | Cosmarium freemanii var. verrucosum A. M. Scott & Prescott |
| Authorship | A. M. Scott & Prescott |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Cosmarium freemanii West & West |
| Citation | 1961 Hydrobiologia 17(1/2): 58 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Cosmarium freemanii var. verrucosum A. M. Scott & Prescott |
| Identification made in | [no date] (2) |
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