| Name | Cosmarium lundellii f. crassangulatum A. M. Scott & Prescott |
| Authorship | A. M. Scott & Prescott |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Cosmarium lundellii Delponte |
| Citation | 1961 Hydrobiologia 17(1/2): 61 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cosmarium lundellii f. crassangulatum A. M. Scott & Prescott |
| Identification made in | [no date] (1) |