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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50-100 μm diam.
S. ternata ? ? chl. 1.5 turns x 92 μm Oura central p. Oura Saitama, 2006
S. ternata 11 samples 3-4 chl. 1-3 turns radiate nuc. 69-88 μm diam. 1997-2006	S. ternata ? 3 chl. 1.5 turns x 88 μm Konuma Sakado Saitama, 2004	S. ternata ? 3 chl. 1.5 turns x 80 μm Tochigi, 2001	Spirogyra sp. 3 chl. 2.5 turns x 82 μm Futago-tamagawa Setagaya ku Tokyo, 2004
Spirogyra sp. 6 chl. 1 turn 92-216 x 82 μm Nagaike park Hachioji Tokyo, 2005	Spirogyra sp. 2 chl. 3.5 turns x 77 μm Kamishiro Hakuba Nagano, 2004	Spirogyra sp. 2 chl. 2.5 turns x 66 μm water treatment c. Sakado Saitama, 2004	S. majuscula 6 chl. 1.5 turns gelatinous sheath 75 μm diam. Fujimi Saitama, 2000 Movies
S. majuscula 6 chl. 1 turns gelatinous sheath 69 μm diam. Yokohama Kanagawa, 2002	Spirogyra sp. 4 chl. 1.5 turns disc/ovoid nuc. x 65 μm Tochigi, 2001	Spirogyra sp. 7 chl. 0.5 turns x 63 μm Toneri Park Tokyo, 2001	Spirogyra sp. 4 chl. 2 turns x 58 μm Abiko Chiba, 2000
Spirogyra sp. 4 chl. 1.5-2 turns spherical nuc. ? 153 x 50 μm Japan, 1998	Spirogyra sp. 4 chl. 1 turns disc-like nuc. 320 x 50 μm Japan, 1998	S. pulchrifigurata ? 3 chl. 2.5 turns x 54 μm Tochigi, 2001	S. pulchrifigurata ? 3 chl. 1.5-2 turns x 56 μm Tama river Chofu Tokyo, 2004
S. distenta 5 samples 2 chl. 2-3 turns spherical nuc. 112 x 53 μm 1998-2004
Spirogyra sp. ? 1 chl. 7.5 turns 125 x 79 μm riverside p. Abukuma river Fukushima, 2005	Spirogyra sp. ? 1 chl. 5 turns x 72 μm Kinu river Takanezawa Tochigi, 2004	Spirogyra sp. ? 1 chl. 5.5 turns x 70 μm Tamogi-ike Nabekura h.l. Nagano, 2008	Spirogyra sp. 1 chl. 5.5 turns disc/ovoid nuc. 160 x 65 μm Kuroiso Tochigi, 1999 Movies
Spirogyra sp. ? 3 irregul. chl. x 51 μm Saitama, 2001	Spirogyra sp. ? 3 irregul. chl. x 51 μm Nakano-numa p. Oura Saitama, 2006	Spirogyra sp. S. ternata ? 3 chl. 1.5 turns 85 x 50 μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2005

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