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Gamophyceae: Zygnematales: Desmidiaceae

 Pleurotaenium trabecula
var. crassum Wittrock

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. crassum Wittrock, cell body 538 μm long, 55 μm diam., L/W=9.8 , x 100, x 200, x 400, x 640, Near Morin-ji (temple), Tatebayashi, Gumma Pref., Japan, June 2001 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 Pleurotaenium
Pleurotaenium Pleurotaenium Pleurotaenium Pleurotaenium
Pleurotaenium Pleurotaenium

Cell body 566 μm long, 48 μm wide, x 100, x 200, x 400
Pleurotaenium Pleurotaenium Pleurotaenium Pleurotaenium

Cell body 604 μm long, 44 μm wide, x 100, x 200, x 400
Pleurotaenium Pleurotaenium Pleurotaenium Pleurotaenium

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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