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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).

Closterium lunula var. biconvexum Schmidle, cell body μm long, μm wide, L/W=, x 100, x 200, x 400, x 640, No.1, Numappara marsh, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, September 3, 2007 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 acerosum Closterium acerosum Closterium acerosum Closterium acerosum
x 640
Closterium acerosum Closterium acerosum

Images of collecting locality: No.1, Numappara marsh, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, September 3, 2007 by Y. Tsukii

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