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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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