Order: Filamentous algae without branching; cell body mostly cylindrical.
Family: Cellwall shows H shape in transverse section;
chloroplasts reticulatedwithout pyrenoids.
Genus: Same as family.
Species:
Microspora tumidula Hazen ?,
cell body 5-10 μm long, 9 μm wide, L/W=0.6-1.1,
x 200, x 400, x 640, Onnenai, Kushiro marsh, Kushiro city, Hokkaido, Japan, October 16, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
x 640