Cosmarium tetraophthalmum var. subrotundum
Cosmarium tetraophthalmum var. rupestre
Cosmarium tetraophthalmum var. rupestris
Cosmarium tetraophthalmum var. crassiverrucosum
Cosmarium tetraophthalmum var. patagonicum
Cosmarium tetraophthalmum var. denotarisii
Cosmarium tetraophthalmum var. lundellii