Species [ f. minor ]: Cell body 26.6-40 μm long, 23-36 μm wide, L/W=, isthmus 8.4-11 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977)

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S. subgrande x 22 μm Tanohara marsh Shiga highland Nagano, 2006	S. subgrande x 21 μm Tanohara marsh Shiga highland Nagano, 2007	S. subgrande x 15 μm near Dedono-yu Nishiwaga Iwate, 2007

Similar species -->> S. lapponicum; S. alternans;

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