Closterium navicula var. crassum
Closterium navicula var. inflatum
Closterium navicula var. navicula
Closterium navicula f. minus
Closterium navicula var. pyrenoidosum
Closterium navicula var. tumidum
Closterium navicula f. duplo-major
Closterium navicula f. major
Closterium navicula f. pyrenoidosum