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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Closterium lunula
(Müller) Nitzsch var. lunula

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: Cell body large, L/W=5-8; inner-side nearly straight, outer-side curved; tapered at both termini (broad circle, slightly inversed); cell wall smooth, transparent, without bands; chloroplasts with many pyrenoids; [var. lunula] 250-(430-552)-1000 μm long, 47-(73-89)-120 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium lunula (Müller) Nitzsch var. lunula, tape No. 0056, time code 0736, cell body 680 μm long, 85 μm wide, L/W =8.0, Vermont-Maine, U.S.A., August 7-13, 1999, by Y. Tsukii

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