Genus: Greater part of axopodia and cell body covered by a thick gelatinous mantle (Kudo, 1966).
Species: About 30 μm in diameter;
often colonial (Kudo, 1966).
Sphaerastrum fockei Greeff ?,
cell body 25 μm in diam., axoneme about 50 μm long,
x 640, Akebono marsh (or bog), Nidanuma (Nitanuma), Tsuchiyu-onsen, Fukushima city, Fukushima Pref., Japan, October 28, 2005 by Y. Tsukii
94 μm; x 640