Cosmarium impressulum var. crenulatum
Cosmarium impressulum var. impressulum
(tree size 1)
Cosmarium impressulum var. alpicola
Cosmarium impressulum var. octangulare
Cosmarium impressulum var. cosandeyi
Cosmarium impressulum f. integratum
Cosmarium impressulum f. minus
Cosmarium impressulum f. scottii
Cosmarium impressulum var. suborthogonum
Cosmarium impressulum var. minus