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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, septum folded, cell body 215 μm long, 28 μm wide, L/W=7.7, a single band-form chloroplasts making 7 turns in each cell, x 400, x 640, water field near Takao bridge, near Takao-sakura park, Kitamoto city, Saitama Pref., April 17, 2005 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Spirogyra Spirogyra Spirogyra Spirogyra
Zygotes 71 μm long, 37 μm wide, L/W=1.9, x 400, x 640
Spirogyra Spirogyra

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