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Chlorophyta: Gamophyceae: Zygnematales: Zygnemataceae

Spirogyra majuscula
Kützing var. majuscula

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 cellls 68-190 μm long, 50-80 μm diam., 5-8 chloroplasts straight or slightly curved; conjugation scalariform, tubes formed from both gametangial cells; zygospores compressed spherical, 70-75 μm diam., medial spore wall thick, 3-5 μm in thickness, brown, smooth when matured (Photomicrographs of the Fresh-water Algae, 1985).

Spirogyra majuscula, tape No. 0038, time code 0000, vegetative cells μm long, 75 μm diam., 6 band-form chloroplast making 1.5 turns in each cell, Awayatsu park, Fujimi city, Saitama Pref., Japan, April 29, 2000 by Y. Tsukii

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