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).
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