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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium lunula
var. biconvexum Schmidle

Closterium lunula Species [var. lunula] : Cell body large, 250-(430-552)-1000 μm long, 47-(73-89)-120 μm wide, L/W=5-8; inner-side nearly straight, outer-side convex; tapered at both termini (broad circle, slightly inversed); cell wall smooth, transparent, without bands; chloroplasts with many pyrenoids.
[var. biconvexum Schmidle]: Inner-side also convex; 455-603 μm long, 85-126 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).
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Closterium lunula, cell body 825 μm long, 113 μm wide, L/W = 7.3, x 100, x 200, x 400, x 640, Higashi-hiroshima city, Hiroshima Pref., Japan, September, 1998 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium Closterium Closterium Closterium Closterium Closterium Closterium Closterium

C. lunula (Müller) Nitzsch var. lunula: 250-(430-552)-1000 μm long, 47-(73-89)-120 μm wide; cell body large, nearly straight; cell wall smooth; many chloroplasts with many pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).

C. lunula var. biconvexum Schmidle: (455)-603 μm long, (85)-97-126 μm wide; cell body more or less curved (Illustrations of The Japanese Fresh-water Algae, 1977).

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