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Gamophyceae: Zygnematales: Zygnemataceae

Spirogyra porticalis
(Müller) Cleve

Spirogyra porticalis 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 66-200 μm long, 40-50 μm diam.; 1 chloroplast making 3-5 turns in each cell; conjugation scalariform, tubes formed from both side; zygospores broad or short ellipsoidal, 50-83 μm long, 40-50 μm wide, internal layer yellowish, spre-surface smooth (Illustrations of The Japanese Fresh-water Algae, 1977).


Spirogyra porticalis (Müller) Cleve, cell body 45-50 μm long, 40 μm wide, a single band-form chloroplast making 2.5 turns in each cell, x 640, damp area near Ichinokawa primary school, Ichino-kawa (river), Higashi-Matsuyama city, Saitama Pref., Japan, March 25, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Spirogyra Spirogyra Spirogyra

Images of collecting locality: Damp area near Ichinokawa primary school, Ichino-kawa (river), Higashi-Matsuyama city, Saitama Pref., Japan, March 25, 2006 by Y. Tsukii


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