Genus: Greater part of axopodia and cell body covered by a thick gelatinous mantle (Kudo, 1966).
Sphaerastrum sp. ?,
cell body 21 μm in diam., axopodia up to 27 μm long,
x 640, wetland near Ichinose-enchi (along super forest road), Norikura highland, Azumi village, Nagano Pref., Japan, May 28, 2005 by Y. Tsukii
94 μm; x 640
Cell body 23 x 28 μm, axopodia up to 60 μm long, x 640
Cell body 26 μm in diam., axopodia up to 65 μm long, x 640