Desmids. Closterium Nitzsch ex Ralfs

Closterium Nitzsch ex Ralfs

Cells are solitary, not medianly constricted, mostly regularly curved and tapered toward both ends. Cellwall smooth or striate. True girdle bands present in some species. Semicells with a single axiale chloroplast, showing longitudinal ridges and one to many large pyrenoids usually in a median row, but in larger species scattered. (Croasdale, H. & Flint, E. 1986. Flora of New Zealand Desmids I. - Wellington Gov. Print.)

Closterium lunula (Müll.) Nitzsch ex Ralfs
Dimensions: L. 400–900 µm, B. 60–100µm. No girdle bands, several pyrenoids. Coesel 1983, Lenzenweger 1996, Ruzicka 1977.

Closterium navicula (Bréb.) Lütkem
Dimensions: L. (25) 35 –65 (105) µm, B. (8) 10–17 (22) µm. Coesel 1983, Lenzenweger 1996, Ruzicka 1977.

Closterium setaceum Ehr. ex Ralfs
Dimensions: L. (150) 220–450 (610) µm, B. (6) 8–13 (16) µm. Cf. also the similarities with C. kuetzingii. Coesel 1983, Lenzenweger 1996, Ruzicka 1977.