![]() [ 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).
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