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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium rostratum
Ehrenberg ex Ralfs 1848

Closterium rostratum Species: Cell body medium in size, slightly curved, central region spindle-shaped, both side convex, both termini slightly swelled, with slanted edges (cf. C. ralfsii), 190-(320-400)-530 μm long, 18-(29-33) μm wide, L/W=11-16; cell wall striated (10 lines within 10 μm), brownish in color; chloroplasts with 3 laminae, 3-5 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium rostratum Ehrenberg, cell body 252 μm long, 27 μm wide, L/W=9.3, x 400, x 640, standing water near Hyoutan-ike (pond), Uba-ga-daira, Nasu town, Tochigi Pref., Japan, July 16, 2006, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium Closterium Closterium Closterium
Cell body 257 μm long, 27 μm wide, L/W=, x 400, x 640
Closterium Closterium Closterium
Cell body 255 μm long, 26 μm wide, L/W=, x 400, x 640
Closterium Closterium Closterium

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