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Chlorophyceae: Sphaeropleales: Sphaeropleaceae

 Sphaeroplea annulina
(Roth) Agardh

Sphaeroplea Genus: Filament without branching; cell body very long, cylindrical in shape, with many ring-shaped chloroplasts; sexual reproduction by oocyte and sperm (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Filamentous algae without branching; cell body cylindrical, very long, 300-500 μm long, 30-50 μm wide, with many nuclei (Illustrations of The Japanese Fresh-water Algae, 1977).

Sphaeroplea annulina (Roth) Agardh, cell body 740 μm long, 35 μm wide, L/W=, x 100, x 200, x 400, x 640, waterfield between Kita-Omachi station and Nogu river, Omachi city, Nagano Pref., Japan, June 4, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Sphaeroplea annulina Sphaeroplea annulina Sphaeroplea annulina Sphaeroplea annulina Sphaeroplea annulina Sphaeroplea annulina
Cell body 560 μm long, 40 μm wide, L/W=,
Sphaeroplea annulina Sphaeroplea annulina Sphaeroplea annulina Sphaeroplea annulina

Images of collecting locality: waterfield between Kita-Omachi station and Nogu river, Omachi city, Nagano Pref., Japan, June 4, 2007 by Y. Tsukii

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