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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Less than 25 μm diam.
Spirogyra sp. 11 samples 1 chl. spherical ? nuc. 24-26 μm diam. 1998-2008	Spirogyra sp. 1 chl. 2.5 turns x 25 μm rice field Shinano Nagano, 2004	Spirogyra sp. 1 chl. 4 turns x 23 μm Kahan Park Kuroiso Tochigi, 2003	Spirogyra sp. 1 chl. 4 turns x 23 μm Kiyasse-Hanyu Hanyu Saitama, 2006
Spirogyra sp. 1 chl. 6 turns x 23 μm Tashirodaira m. Hakkoda mountain Aomori, 2005	Spirogyra sp. 1 chl. 4.5 turns x 23 μm Tashirodaira m.5 Hakkoda mountain Aomori, 2006
Spirogyra sp. 1 chl. 4 turns 122 x 22 μm Akigase park Saitama Saitama, 2005	Spirogyra sp. 1 chl. 2 turns 35-45 x 21 μm Oura central p. Oura Gunma, 2006	Spirogyra sp. 1 chl. 7 turns 173 x 20 μm Ohnuma Nasu-shiobara Tochigi, 2006
Spirogyra sp. 1 chl. 5 turns 205 x 22 μm Kowashimizu Suwa Nagano, 2005	Spirogyra sp. 1 chl. 4 turns x 21 μm Ishinazaka Furukawa Miyagi, 2003	Spirogyra sp. 1 chl. ? turns x 21 μm Kawaguchi Natural p. Kawaguchi Saitama, 2005	Spirogyra sp. 2 samples 4 chl. 3-4 turns ovoid nuc. 25 μm 1998-99
Spirogyra sp. 1 chl. 3.5 turns x 20 μm Saitama, 2001	Spirogyra sp. 1 chl. 5 turns x 20 μm Hasuda Saitama, 2002	Spirogyra sp. 1 chl. 6 turns x 20 μm Nakano-numa p. Oura Gunma, 2006	Spirogyra sp. 2 chl. 2 turns x 20 μm near Okubo ike Shinano Nagano, 2004
Spirogyra sp. 2 chl. 2 turns 150 x 19 μm Futayo-no-ike Haguro mountain Yamagata, 2005	Lateral conj. 1 chl. 2-3 turns x 19 μm Minuma-no-numa Omiya daisan Park Saitama, 2005	Spirogyra sp. 1 chl. 2.5 turns 57 x 20 μm near Takao-sakura p. Kitamoto Saitama, 2005	Spirogyra sp. 1 chl. 2.5 turns 150 x 19 μm Heisei-no-mori p. Kawajima Saitama, 2006
Spirogyra sp. 1 chl. 5 turns 135 x 19 μm Lake Kizaki Omachi Nagano, 2005	Spirogyra sp. 1 chl. 4 turns 78 x 18 μm Kitayama park Higashi-Murayama Tokyo, 2006	Spirogyra sp.1 1 chl. 5 turns 125 x 16 μm Tochigi, 2001	Spirogyra sp.1 1 chl. 4.5 turns 50-94 x 16 μm Japan, 199?
Spirogyra sp. 1 chl. turns x 12 μm Showa Memorial p. Tokyo, 2001	Spirogyra sp. 1 chl. turns x 12 μm Shikinawa-ike Fukuoka, 2001	Spirogyra sp. 1 chl. 3.5 turns x 12,13 μm Futayo-no-ike Haguro mountain Yamagata, 2005	Spirogyra sp. 1 chl. 6 turns x 13 μm near Omine mt. Minakami Gunma, 2006
Spirogyra sp. 1 chl. turns x 11 μm Omine-numa Tsukiyono Gunma, 2003

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