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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 μm long, μm wide, L/W=, x 200, x 400, x 640, No.2, a small pond along Prefectural road route 272 (Tsukiyono-Sarugakyo-Onsen-sen, 36°41'43"N, 138°57'56"E), Tsukiyono, Minakami town, Gunma Pref., Japan, October 12, 2008 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

Images of collecting locality: No.1, a small pond (Sumano-simo-tameike) near Prefectural road route 272 (Tsukiyono-Sarugakyo-Onsen-sen), Tsukiyono, Minakami town, Gunma Pref., Japan, October 12, 2008 by Y. Tsukii

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