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Gamophyceae: Zygnematales: Zygnemataceae

 Spirogyra tenuissima
(Hassall) Kützing

Spirogyra tenuissima 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 66-198 μm long, 10-14 μm diam.; 1 chloroplast making 3.5-6 turns in each cell; conjugation scalariform, female gametangium swelled; zygospores elliptical (44-62 μm long, 20-28 μm wide) (Illustrations of The Japanese Fresh-water Algae, 1977).

Spirogyra sp., cell body 220 μm long, 14 μm wide, L/W=, septum folded, a single band-form chloroplast making 2-4 turns in each cell, x 400, x 640, used waterfield near Karakemi marsh (Yasaka village), Matsuzaki, Omachi city, Nagano Pref., Japan, April 24, 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
Cell body 110-144 μm long, 16 μm wide, L/W=, cells undergoing lateral conjugation, x 200, x 400, x 640
Spirogyra Spirogyra Spirogyra Spirogyra Spirogyra Spirogyra
Lateral conjugation, cell body 138 μm long, 16 μm wide, L/W=, x 400, x 640
Spirogyra Spirogyra
Zygotes formed by lateral conjugation, 65 μm long, 32 μm wide (left), x 400, x 640
Spirogyra Spirogyra Spirogyra Spirogyra
Zygotes μm long, μm wide, L/W=, x 400, x 640
Spirogyra Spirogyra Spirogyra Spirogyra
Zygotes 54 μm long, 34 μm wide (left), 62 μm long, 31 μm wide (right), x 200, x 400, x 640
Spirogyra Spirogyra Spirogyra

* Spirogyra tenuissima (Hassall) Kützing: Vegetative cells 66-198 μm long, 10-14 μm diam., 1 chloroplast making 3.5-6 tuns in each cell (Illustrations of The Japanese Fresh-water Algae, 1977).

Spirogyra arta Jao: 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).

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