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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 (or C. acutum var. variabile ?), cell body 215 μm long, 8 μm wide, L/W=26.9, x 400, x 640, Yacho-no-mori marsh (near road sign No. 4), Sukawa highland, Kurikoma mountain, Higashi-naruse village, Akita Pref., Japan, July 24, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium Closterium
Cell body 240 μm long, 8 μm wide, L/W=30, x 400, x 640
Closterium Closterium
Cell body 205 μm long, 7 μm wide, L/W=29.3, x 400, x 640
Closterium Closterium
Cell body 202 μm long, 6.5 μm wide, L/W=31.1, x 400, x 640
Closterium Closterium

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