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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium sp.

Closterium Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded; cell wall smooth or with longitudinal lines, bands on the cell wall in some species; chloroplast laminae ridged and radially arranged, which makes cross section star-shaped; pyrenoids aligned or scattered (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

Closterium ehrenbergii var. ??, cell body 980 μm long, 96 μm wide, L/W=, x 100, x 200, x 400, x 640, Aquatic botanical garden, Sawara city, Chiba Pref., Japan, October 11, 2004 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
x 100
Closterium
x 200
Closterium Closterium Closterium
x 400
Closterium Closterium Closterium Closterium
x 640
Closterium Closterium Closterium
Very fine striae partly visible, x 640
Closterium Closterium Closterium Closterium Closterium
Cell body 1040 μm long, 96 μm wide, L/W=, x 100
Closterium Closterium Closterium
x 200, x 400
Closterium Closterium Closterium
x 640
Closterium Closterium Closterium

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