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Chlorophyta: Gamophyceae: Zygnematales: Zygnemataceae

Spirogyra varians
(Hassall) Kützing

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 30-70 μm long, 30-38 μm wide; a single chloroplast making 1-4 turns in each cell; conjugation scalariform; female gametangium swelled toward male gametangium; zygospores ellipsoidal or broad ellipsoidal or spherical in shape (45-65 μm long, 30-35 μm wide) (Illustrations of The Japanese Fresh-water Algae, 1977).

Spirogyra varians (Hassall) Kützing, conjugation, tape No. 0038, time code 1016, vegetative cells μm long, 35 μm diam., one band-form chloroplast making 3.5 turns in each cell, Awayatsu park, Fujimi city, Saitama Pref., Japan, May 17, 2000 by Y. Tsukii

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