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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium subulatum
(Kützing) Brébisson

Closterium subulatum Species [ var. sublatum ]:
[ var. maius Krieger]: Cell body slightly curved, spindle-shaped, both ends elongate, 304-323 μm long, 15 μm wide; cell wall smooth, colourless (Illustrations of The Japanese Fresh-water Algae, 1977).
170-323 μm long, 15-18 μm wide, L/W=10-20; 4-5 pyrenoids in each chloroplast (Photomicrographs of the Freshwater Algae, vol.3, 1985).

Closterium subulatum (Kützing) Brébisson ?, cell body μm long, μm wide, L/W=, x 200, x 400, x 640, No.2, Ochiai-numa (pond), Noshiro city, Akita Pref., Japan, September 22, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium subulatum Closterium subulatum Closterium subulatum Closterium subulatum Closterium subulatum Closterium subulatum

Images of collecting locality: No.2, Ochiai-numa (pond), Noshiro city, Akita Pref., Japan, September 22, 2007 by Y. Tsukii

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