Closterium ulna var. recurvatum
(tree size 1)
Closterium ulna var. ulna
Closterium ulna f. maius
Closterium ulna f. minus
Closterium ulna f. striatum
Closterium ulna var. constrictum
Closterium ulna var. anastomosum
Closterium ulna var. robusta
Closterium ulna var. striolatum-punctatum