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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium lunula
var. biconvexum Schmidle

Closterium lunula Species: Cell body large, L/W=5-8; inner-side nearly straight, outer-side curved; tapered at both termini (broad circle, slightly inversed); cell wall smooth, transparent, without bands; chloroplasts with many pyrenoids; [var. lunula] 250-(430-552)-1000 μm long, 47-(73-89)-120 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
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Closterium lunula var. biconvexum Schmidle, cell body 825 μm long, 118 μm wide, L/W = 7.0, x 100, x 200, x 400, x 640, Torinome kasen park, Nasu-shiobara city (formerly Kuroiso city), Tochigi 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

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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