Closterium costatum var. costatum
Closterium costatum var. dilatatum
Closterium costatum var. scotii
Closterium costatum var. subcostatum
Closterium costatum var. westii
(tree size 1)
Closterium costatum var. borgei
Closterium costatum var. angustum
Closterium costatum f. inflatum
Closterium costatum f. borgeanum
Closterium costatum var. curtum
Closterium costatum var. erectum
Closterium costatum var. multipyrenoidum
Closterium costatum f. rectum
Closterium costatum var. scottii
Closterium costatum var. subtumidum
Closterium costatum var. levis
Closterium costatum var. spirostriolatum
Closterium costatum var. turgidulum
Closterium costatum var. wagae
Closterium costatum f. intermedia
Closterium costatum f. klebsii