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: No. 2, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii