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Gamophyceae: Zygnematales: Desmidiaceae

 Pleurotaenium trabecula
var. elongatum Cedergren

Pleurotaenium trabecula Species [ var. trabecula ]: Vegetative cells cylindrical, 260-660 μm long, 24-45 μm diam., L/W=11-18, constricted at center, semicells bulged at base; chloroplast elongate, with 3-4 laminae; cell wall dotted.
[ var. crassum Wittrock ]: Cell body shorter and wider than var. trabecula, 275-554 μm long, 30-57 μm wide, L/W=6-7 (not exceed 10).
[ var. rectum (Delponte) W. et G.S. West ]: Cell body thinner than var. trabecula, 180-493 μm long, 14-23 μm wide, L/W=12-18.
[ var. elongatum Cedergren ]: Cell body longer than var. trabecula, 600-830 μm long, 30-40 μm wide, L/W=19-28.
[ var. maximum (Reinsch) Roll ]: Cell body 350-1120 μm long, 44-65 μm wide, L/W=8-17 (Illustrations of The Japanese Fresh-water Algae, 1977).

Pleurotaenium trabecula var. elongatum Cedergren ?, cell body 700 μm long, 39 μm wide, L/W=17.9, cell surface smooth, x 640, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, September 2002 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Pleurotaenium trabecula Pleurotaenium trabecula Pleurotaenium trabecula Pleurotaenium trabecula
Pleurotaenium trabecula Pleurotaenium trabecula

Pleurotaenium trabecula (Ehrenberg) Nägeli var. trabecula: Vegetative cells cylindrical, L/W = 11-18, constricted at center, 260- (384-616) -660 μm long, 24- (25-45) μm diam. (Illustrations of The Japanese Fresh-water Algae, 1977).

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