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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium idiosporum
W. et G.S. West

Closterium idiosporum Species: Cell body elongated spindle-shaped, 220-(240-312) μm long, (10-11)-14 μm wide, L/W=20-26 (cf. C. strigosum,150-410 μ L/W=10-18); cell wall transparent, smooth; chloroplasts with 3-6 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).
Cell body (110-)150-250(-310) μm long, (6-)8-12(-14) μm wide; L/W=(12-)15-30(-35), (Coesel & Meesters 2007).

Closterium idiosporum W. et G.S. West , cell body 223 μm long, 7 μm wide, L/W=31.9, x 400, x 640, Watasuge marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium Closterium

Closterium idiosporum W. et G.S. West , cell body 127 μm long, 3.5 μm wide, x 640, Watasuge marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium
Cell body 115 μm long, 4 μm wide, x 640
Closterium

Images of collecting locality: Watasuge marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii

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