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Gamophyceae: Zygnematales: Zygnemataceae

 Spirogyra sp.

Spirogyra 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, cell body 140 μm long, 13 μm wide, L/W=, a single chloroplasts making 3.5 turns in each cell, x 400, x 640, Futayo-no-ike (pond) near Haguro mountain, Haguro town, Yamagata Pref., Japan, July 10, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Spirogyra Spirogyra
Cell body 85 μm long, 12 μm wide, L/W=7.1, 2 chloroplasts making 3.5 turns in each cell
Spirogyra

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