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Gamophyceae: Zygnematales: Desmidiaceae
(Charophyceae: Zygnematales: Desmidiaceae)

Closterium lunula
var. biconvexum Schmidle

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 var. biconvexum Schmidle, tape No. 0123, time code 0344, cell body 825 μm long, 118 μm wide, L/W = 7.0, Torinome kasen park, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, September 1998 by Y. Tsukii


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