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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium calosporum
var. maius W. et G.S. West

Closterium calosporum Species: [var. calosporum] Cell body well curved, inner side straight or concave, tapered toward both ends, truncated with slanted edges (cf. C. parvulum); small pores present at outside of the ends; 70-(95-110)-116 μm long, 8-(12-13) μm wide, L/W=7-10 (cf. C. dianae); 3-5 pyrenoids in each chloroplast; cell wall smooth or brownish in color.
[var. brasiliense] Slender than var. calosporum, 90-(126-150)-195 μm long, 5-(8)-11 μm wide, L/W=12-16
[var. maius] Larger than var. calosporum, curvature small, 120-(176)-192 μm long, 13-(17)-18 μm wide, L/W=11-12 (Illustrations of The Japanese Fresh-water Algae, 1977).


Closterium calosporum Wittrock ? or similar species, cell body 108 μm long, 12 μm wide, L/W=9.0, x 640, Furuike marsh, Togakushi highland, Shinano town, Nagano Pref., Japan, June 12, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium calosporum Closterium calosporum


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