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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 102 μm long, 15 μm wide, L/W=6.8, a single broad band-form chloroplast making 4 turns in each cell (?), x 400, x 640, Gyodashi-sogo park (Gyoda general park), Gyoda city, Saitama Pref., Japan, March 11, 2006 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

Images of collecting locality: Gyodashi-sogo park (Gyoda general park), Gyoda city, Saitama Pref., Japan, March 11, 2006 by Y. Tsukii

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