Cosmarium laeve var. octangulare
Cosmarium laeve var. westii
Cosmarium laeve var. acervatum
Cosmarium laeve var. africanum
Cosmarium laeve var. brasiliense
Cosmarium laeve var. cymatium
Cosmarium laeve var. depressum
Cosmarium laeve var. distentum
Cosmarium laeve var. pseudo-octangulare
Cosmarium laeve var. rotundatum
Cosmarium laeve var. undulatum
Cosmarium laeve f. lacustre
Cosmarium laeve f. majus
Cosmarium laeve f. maximum
Cosmarium laeve f. protuberans
Cosmarium laeve f. raciborskii