Genus: Filament without branching; cell body cylindrical; one or several chloroplasts band-shaped, spirally arranged within the cell, pyrenoids present; septum with or without folded structure (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). About 300 species (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Vegetative cells 30-70 μm long, 30-38 μm wide; a single chloroplast making 1-4 turns in each cell; conjugation scalariform; female gametangium swelled toward male gametangium; zygospores ellipsoidal or broad ellipsoidal or spherical in shape (45-65 μm long, 30-35 μm wide) (Illustrations of The Japanese Fresh-water Algae, 1977).

S. varians 1 chloplast disc-like nuc. 35 μm diam. Fujimi Saitama, 2000 Movies	S. varians ? 1 chl. 2-2.5 turns disc-like nuc. 36 μm diam. Tochigi, 2001	S. varians ? 1 chl. 3-3.5 turns 35 μm diam. Koaze river Saitama, 2002	S. varians ? 1 chl. 2-3 turns 36 μm diam. Futago-tamagawa Setagaya Tokyo, 2004
S. varians ? 1 chl. 7.5 turns 35 μm diam. Ishinazaka Furukawa Miyagi, 2003	S. varians 1 chl. 6 turns 112 x 28 μm Aquatic botanical g. Sawara Chiba, 2004	S. varians ? 1 chl. 2-3.5 turns 40-80 x 37 μm near Minuma n. p. Saitama Saitama, 2005	S. varians ? 1 chl. 3.5 turns 83 x 37 μm Akanuma Hatoyama Saitama, 2004
S. varians ? 1 chl. 2-4 turns 43-100 x 32-35 μm near Takao-sakura p. Kitamoto Saitama, 2005	S. varians ? 1 chl. 2-2.5 turns 37-42 x 37 μm Shiroyama Park Okegawa Saitama, 2006	S. varians ? 1 chl. 3.5 turns 80-85 x 38 μm Shimo-nanbata Fujimi Saitama, 2006

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