Family: Filamentous algae without branching; cell body cylindrical; chloroplasts band-, plate- or star-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).
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).

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More than 100 μm diam.
Spirogyra sp. 11 chl. 1 turns x 155 μm Tsukamoto Nishi-ku Saitama, 2004	S. margaritata ? irregular chl. radiate nuc. 225 x 140 μm Yamagata, 1999	S. margaritata ? x μm chl. Toneri Park Tokyo, 2001	S. margaritata ? x 144-148 μm 14 chl. Kurihashi Saitama, 2001
S. sp.8 6 ? chl. x μm Japan, 199? by N. Sugiyama	S. ellipsospora ? 5 chl., 2.5 turns 328 x 124 μm Kabuto-yama Nishi-no-miya Hyogo, 2004	S. ellipsospora ? 3 or 4 chl. radiate nuc. 135-220 x 130 μm Saitama, 1999	S. ellipsospora ? 3? chl. spherical nuc. 200 x 100 μm Japan, 1998 Movies
S. setiformis 3 chl. 3.5 turns x 108 μm Doman G.P. Toda Saitama, 2001	S. setiformis 3 chl. 3.5 turns x 108 μm Doman G.P. Toda Saitama, 2001	S. setiformis 3 chl. 2.5-3.25 turns x 110 μm Ikoi-no-mori p. Fuchu Tokyo, 2004	S. setiformis 4 chl. 1.5 turns x 110 μm Tama river Chofu Tokyo, 2004
Spirogyra sp. 5 chl. 2.25 turns x 112 μm Zenko-ji Nagano, 2003	Spirogyra sp. 8 chl. 1 turns x 100 μm Fukuda 1862 Namegawa Saitama, 2004	Spirogyra sp. 3 chl. 1.3-1.5 turns x 100 μm Konuma Sakado Saitama, 2004	Spirogyra sp. 4 chl. 2.5 turns x 100 μm Banpaku memorial p. Tsukuba Ibaraki, 2006
Spirogyra sp. 3 chl. 2.2 turns x 106 μm Hanyu-Suigo Park Hanyu Saitama, 2006

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