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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Septum folded:
Spirogyra sp. 1 chl. 5.5 turns x 30 μm Tsukamoto Nishi-ku Saitama, 2004	Spirogyra sp. 1 chl. 6 turns x 29 μm Numa-no-hara m. Madarao highland Niigata, 2005	Spirogyra sp. 1 chl. 7 turns x 28 μm near Takao-sakura p. Kitamoto Saitama, 2005	Spirogyra sp. 1 chl. 6.5 turns x 28 μm Saitama, 2001
Spirogyra sp. 1 chl. 8 turns x 28 μm Shobu Saitama, 2004	Spirogyra sp. 1 chl. 2.5 turns x 28 μm Kinu-gawa g. p. Takanezawa Tochigi, 2004	Spirogyra sp. 1 chl. 4.5 turns x 26 μm Miyado Asaka Saitama, 2004	Spirogyra sp. 1 chl. 5 turns x 26 μm Yasuji-kawa Sawara Chiba, 2004
Spirogyra sp. 1 chl. 3-4 turns x 22 μm Nasuno-ga-hara m. Nishi-nasuno Tochigi, 2004	Spirogyra sp. 1 chl. 6.5 turns x 21,25 μm Oura central p. Oura Gunma, 2006	S. tumida ? 1 chl. 6 turns x 18-20 μm Kasukabe Saitama, 2004	S. arta ? 1 chl. 6 turns x 20 μm Saitama, 2001
S. arta ? 1 chl. 7 turns 222 x 20 μm Oyomi marsh Hakuba Nagano, 2006	S. arta ? 1 chl. 6 turns x 19 μm Kinu-gawa g. p. Takanezawa Tochigi, 2004	S. arta ? 1 chl. 8 turns spherical nuc. 280 x 18 μm Japan, 1998 Movies	S. arta ? 1 chl. 4 turns 240 x 17 μm Numa-no-hara m. Madarao highland Niigata, 2005
S. arta ? 1 chl. 5.5 turns 126 x 17 μm Satsunai river Obihiro Hokkaido, 2005	S. tenuissima ? 1 chl. 4 turns x 15 μm Ishinazaka Furukawa Miyagi, 2003	S. tenuissima 1 chl. 6 turns 158 x 14 μm Tochigi, 1998	S. tenuissima ? 1 chl. 4 turns 102 x 15 μm Gyodashi-sogo Gyoda Saitama, 2006
S. tenuissima ? 1 chl. 9 turns 280 x 15 μm near Murakuni ike Iwatsuki-bunka p. Saitama, 2006	S. tenuissima 1 chl. 6 turns x 15 μm ??, 2000	S. tenuissima 1 chl. 4 turns 220 x 14 μm near Karakemi m. Omachi Nagano, 2005
Spirogyra sp. 1 chl. 6 turns x 12 μm Ukima Tokyo, 2001	Spirogyra sp. 1 chl. turns x 12 μm Shikinawa-ike Fukuoka, 2001	Spirogyra sp. 1 chl. turns x 11.5 μm Univ. A.V.M. Obihiro Hokkaido, 2005	Spirogyra sp. 1 chl. 4.5 turns x 13 μm near Akai wetland Aizuwakamatsu Fukushima, 2005

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