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Gamophyceae: Zygnematales: Desmidiaceae
(Charophyceae: Zygnematales: Desmidiaceae)
Closterium rectimarginatum
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 ?,
tape No. 0123, time code 3436,
cell body 165 μm long, 26 μm wide,
L/W = 6.3, 3-4 pyrenoids in each semicell,
x 200, x 400, x 640, Higashi-hiroshima city, Hiroshima Pref., Japan, September 1998 by Y. Tsukii
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