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Chlorophyceae: Chlorococcales: Micractiniaceae

 Micractinium pusillum
Fresenius var. pusillum

Micractinium Family: Unicellular or Colonial; cell body spherical, with one or more spiny projections; a single cup-shaped chloroplast with a pyrenoid; asexual reproduction by zoospore or autospore; sexual reproduction by fertilization between egg and sperm.
Genus: Colonial; cell body with 2 or more spiny hairs (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Similar genus --> Golenkinia; Franceia; Acanthosphaera;

Micractinium pussillum ?, cell body 6-9 μm in diam., spines ~35 μm long, S/L=3.9, x 400, x 640, Basho-no-yakata (Basho Center), Kurobane town, Tochigi Pref., Japan, January 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640

Micractinium pussillum ?, x 400, x 640, Karasu-ga-mori koen, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., January 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640

Micractinium pussillum Fresenius var. elegans G. M. Smith: a colony of 4-32 spherical cells, cell body 3-5 μm diam., with 2-3 needle-like projections 20-30 μm long, a single cup-shaped chloroplast with a pyrenoid (Illustrations of The Japanese Fresh-water Algae, 1977).

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