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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium angustatum
Kützing var. angustatum f. angustatum

Closterium angustatum 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 angustatum Kützing var. angustatum f. angustatum, cell body 470 μm long, 22 μm wide, L/W=21.4, x 200, x 400, x 640, a pond near the entrance of climbing route to Omine mountain, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, May 25, 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 angustatum Closterium angustatum Closterium angustatum Closterium angustatum Closterium angustatum Closterium angustatum Closterium angustatum Closterium angustatum
Cell body μm long, 25 μm wide, L/W=, x 640
Closterium angustatum Closterium angustatum Closterium angustatum
Cell body μm long, 26 μm wide, L/W=, x 640
Closterium angustatum Closterium angustatum Closterium angustatum

Images of collecting locality: a pond near the entrance of climbing route to Omine mountain, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, May 25, 2006 by Y. Tsukii

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