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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium rectimarginatum

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Closterium libellula 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 rectimarginatum ?, cell body 122 μm long, 11 μm wide, L/W=11.1, x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium Closterium Closterium
Cell body μm long, μm wide, L/W=, x 640
Closterium Closterium

Images of collecting locality: Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008 by Eizaburo Tsukii

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