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Chlorophyta: Gamophyceae: Zygnematales: Zygnemataceae

Spirogyra arta

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: Vegetative cells 165-225 μm long, 15-17 μm diam., 1 chloroplast making 4-7 turns in each cell (Illustrations of The Japanese Fresh-water Algae, 1977).

Spirogyra arta (or S. tumida), tape No. 0068, time code 0000, vegetative cells 280 μm long, 18 μm diam., 1 band-form chloroplast making 8 turns in each cell, Japan, September 1998 by Y. Tsukii

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