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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium turgidum
Ehrenberg ex Ralfs var. borgei (Borge) Deflandre

Closterium turgidum 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 turgidum Ehrenberg var. turgidum, cell body 720 μm long, 54 μm wide, L/W=13.3, x 100, x 200, x 400, x 640, No.2, Ukima-ga-ike (pond), Ukima Park, Kita-ku and Itabashi-ku, Tokyo, Japan, October 15, 2006 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 turgidum Closterium turgidum Closterium turgidum Closterium turgidum
x 640
Closterium turgidum Closterium turgidum Closterium turgidum Closterium turgidum Closterium turgidum Closterium turgidum Closterium turgidum Closterium turgidum Closterium turgidum

Images of collecting locality: No.2, Ukima-ga-ike (pond), Ukima Park, Kita-ku and Itabashi-ku, Tokyo, Japan, October 15, 2006 by Y. Tsukii

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