Closterium ralfsii var. gracilius
Closterium ralfsii var. hybridum
(tree size 4)
Closterium ralfsii var. immane
Closterium ralfsii var. kriegeri
Closterium ralfsii var. montanum
Closterium ralfsii var. novae-angliae
Closterium ralfsii var. ralfsii
Closterium ralfsii var. pterosporum
Closterium ralfsii var. nodosum
Closterium ralfsii var. subralfsii
Closterium ralfsii var. minus
Closterium ralfsii f. bohemicum
Closterium ralfsii var. glentigianum
Closterium ralfsii f. procerum
Closterium ralfsii f. laeve
Closterium ralfsii f. sigmoideum
Closterium ralfsii var. subpunctatum
Closterium ralfsii var. major
Closterium ralfsii var. minor