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Chlorophyceae: Chlorococcales: Micractiniaceae

 Acanthosphaera zachariasii
Lemmermann var. zachariasii

Acanthosphaera Genus: Unicells, planktonic; cell body spherical, surrounded by many elongated spiny projections, 1/3 from their base thickened, remainings hairly; a single chloroplast cup-shaped, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body spherical, 8-15 μm in diam., spiny projections 30-38 μm long (Introduction to the Freshwater Algae, 1999).

Acanthosphaera zachariasii Lemmermann var. zachariasii, cell body spherical, 13 μm in diam., projections 20 μm long (tubular part 8 μm, hairly part 12 μm), x 640, Karasu-ga-mori park, Nasu-shiobara city (formerly Nishi-nasuno town), Tochigi Pref., Japan, September 4, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Acanthosphaera Acanthosphaera Acanthosphaera

Images of collecting locality: Karasu-ga-mori park, Nasu-shiobara city (formerly Nishi-nasuno town), Tochigi Pref., Japan, September 4, 2006 by Y. Tsukii

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