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

Closterium parvulum
Brébisson var. parvulum

Species: [ var. parvulum ]: Cell body curved, not swelled at the center (inner side straight or slightly concaved), tapered toward both thorn-like or slightly rounded ends (cf. C. calosporum), a small pore present on its outer side, 60-160 μm long, (8.5-15)-17 μm wide, L/W=7-10; cell wall smooth, transparent; chloroplasts with fewer laminae (only two visible); 3-5 pyrenoids in each chloroplast.
[ var. angustum ]: Elongate and thinner than var. parvulum, 75-(98-141) μm long, 5-(8.5-11) μm wide, L/W=11-15; curvature variable (Illustrations of The Japanese Fresh-water Algae, 1977).


Closterium parvulum, tape No. 0123, time code 3533, Higashi-hiroshima city, Hiroshima Pref., Japan, September, 1998 by Y. Tsukii


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