| Cosmarium pusillum (BREB.) ARCH. |  | | |
| | Cosmarium pyramidatum BREB. |  | | |
| | Cosmarium pyramidatum BREB. var. stenonotum (NORDST.) KLEBS |  | | |
|
| Cosmarium quadratulum var. boldtii (MESSIK.) KRIEGER & GERLOFF |  | | |
| | Cosmarium quadratum RALFS |  | | |
| | Cosmarium quadratum var. willei (SCHMIDLE) KRIEGER & GERLOFF |  | | |
|
| Cosmarium quadrum LUND. |  | | |
| | Cosmarium raciborskii (RACIB.) LAGERH. |  | | |
| | Cosmarium rectangulare GRUNOW |  | | |
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