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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 390 μm long, 20 μm wide, L/W=19.5, x 200, x 400, x 640, Ohnuma (a pond in Ohnuma enchi), Nasu-shiobara city (formerly Shiobara town), Tochigi Pref., Japan, May 5, 2006, 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

Images of collecting locality: Ohnuma (a pond in Ohnuma enchi), Nasu-shiobara city (formerly Shiobara town), Tochigi Pref., Japan, May 5, 2006, by Y. Tsukii


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