Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species:

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f. spinosa :
S. furcatum f. spinosa 26 x 27 μm Iroha-numa Zao mountain Yamagata, 2005	S. furcatum ? f. spinosa 26 x 27 μm Tashirodaira m. Hakkoda mountain Aomori, 2005	S. furcatum f. spinosa 33 x 30 μm near Iroha-numa Zao mountain Yamagata, 2006	S. furcatum f. spinosa 31 x 27 μm Kodanuki marsh Fujinomiya Shizuoka, 2006
var. subsenarium :
S. furcatum v. subsenarium stock Tnk-5 Numappara marsh Kuroiso Tochigi, 2003	S. furcatum v. subsenarium stock Mfk-1 Kejo-numa Furukawa Miyagi, 2003

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