Closterium cornu var. arcum
Closterium cornu var. cornu
Closterium cornu var. brasiliense
Closterium cornu var. angustum
Closterium cornu var. siamense
Closterium cornu var. lundellii
Closterium cornu var. javanicum
Closterium cornu f. majus
Closterium cornu var. minus
Closterium cornu var. tenuissima
Closterium cornu var. upsaliense
Closterium cornu var. sigmoidea
Closterium cornu subsp. croasdalei
Closterium cornu f. elongata
Closterium cornu f. hyalina
Closterium cornu f. tumida