Ulvophyceae: Ulotrichales: Ulotrichaceae
Phylum Viridiplantae: Subphylum Streptohyta: Class Klebsormidiophyceae (Protistology, 2003)

Klebsormidium
Syn.: Chlorhormidium; Hormidium

Order: Filamentous algae without branching; cell body mostly cylindrical.
Family: Chloroplasts plate-like or ribbon-like; sexual reproduction by isogamy.
Genus: Without gelatinous sheath; filaments consist of many cells; no rhizoid (Illustrations of The Japanese Fresh-water Algae, 1977).

Klebsormidium sp. 2 clips μm Nasu-shiobara Japan, 1998?