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:

Spirogyra sp. 1 chl. 5 turns 202 x 26 μm Saitama, 1999	Spirogyra sp. 1 chl. 8-9 turns x 26 μm Senjo-ga-hara Nikko Tochigi, 2003	Spirogyra sp. 1 chl. 2-5 turns 212 x 24 μm Japan, 1998	Spirogyra sp. 1 chl. 5.5 turns x 24 μm Hasuda Saitama, 2002
Spirogyra sp. 1 chl. 5 turns 83 x 24 μm Saitama, 1999	Spirogyra sp. 1 chl. ? turns 81 x 22 μm Saitama, 2000	Spirogyra sp. 1 chl. 3-4 turns 137-350 x 24 μm Kanayama chosei-chi Kiyose Tokyo, 2004	Spirogyra sp. 1 chl. 4.5 turns x 24 μm Norin Park Kawamoto Saitama, 2004
Spirogyra sp. 1 chl. 7 turns 57,175 x 25 μm Banpaku memorial p. Tsukuba Ibaraki, 2006	Spirogyra sp. 1 chl. 5 turns 160 x 24 μm Motoyu marsh Nikko Tochigi, 2008	Spirogyra sp. 1 chl. 5.5 turns 105 x 25 μm Igashira park Mooka Tochigi, 2006

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