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:

31 μm 63 μm 94 μm; x 640

Images of collecting locality: Midoriga-ike (pond), Togakushi forest botanical garden, Togakushi highland, Nagano city (formerly Togakushi village), Nagano Pref., Japan, May 21, 2006 by Y. Tsukii