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. 3 band-form chl. 500 x 33 μm Japan, 1998	Spirogyra sp. 3 band-form chl. 138 x 29 μm Saitama, 1999	Spirogyra sp. 3 band-form chl. 162-244 x 35 μm Japan, 1997	Spirogyra sp. band-form chl. x μm Japan, 1998
Spirogyra sp. band-form chl. gelatinous sheath x μm Japan, 1998	Spirogyra sp. 3 chl. 3 turns x 30 μm Saitama, 2001	Spirogyra sp. 3 chl. 3 turns gelatinous sheath x 31 μm Kurihashi Saitama, 2001	Spirogyra sp. chl. turns gelatinous sheath x 34 μm Showa Memorial p. Tokyo, 2001
Spirogyra sp. 3 chl. 3 turns x 33 μm Iruma City M. Iruma Saitama, 2006

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