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Gamophyceae: Zygnematales: Desmidiaceae

Haplotaenium minutum
(Ralfs) Bando 1988
Syn. Pleurotaenium minutum (Ralfs) Delponte

Pleurotaenium minutum Species [ var. minutum ]: Cell body cylindrical, 50-230 μm long, 7-18 μm wide, L/W=8-12; semicells not swelled at base, slightly tapered, with blunt and smooth ends; cell wall smooth or finely dotted; chloroplasts located along cenral axis, with about 6 laminae; pyrenoids arranged linearly, 3-7 in each semicells.
[ var. elongatum (W. et G.S. West) Cedergren ]: 257-550 μm long, 8-16 μm wide, L/W=28-40;
[ var. crassum (W. West) Krieger ]: Shorter and wider than v. minutum, 40-102 μm long, 12-20 μm wide, L/W=4-5;
[ var. cylindricum (Borge) Krieger ]: 175-300 μm long, 15.5-21 μm wide, L/W=14-15;
[ var. gracile (Wille) Krieger ]: Thinner and longer than v. minutum, 110-240 μm long, 6.5-15 μm wide, L/W=14-20;
[ var. latum Kaiser ]: Wider than v. minutum, 160-352 μm long, 19-28 μm wide, L/W=8-11 (Illustrations of The Japanese Fresh-water Algae, 1977).

Pleurotaenium minutum (Ralfs) Delponte var. minutum, cell body 125 μm long, 12 μm wide, L/W=10.4, x 640, Ushidome-ike (pond), Norikura highland, Azumi village, Nagano Pref., Japan, May 28, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Pleurotaenium minutum Pleurotaenium minutum
Cell body 119 μm long, 12 μm wide, L/W=9.9, x 640
Pleurotaenium minutum

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