Family: Filamentous algae attached to a substrate at base, differentiation of axis-branch structure variable; cell body cylindrical, spherical or elongated ellipsoidal, with one or several plate-like chloroplasts; pyrenoids one to several in number or absent; terminal cells tapered or rounded at its end (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Filament with branching; cell body cylindrical; a single chloroplast plate-like, slightly curved, with 1 to several pyrenoids; apical cells pointed or drawn out as hairly projections; no difference between axial and branching filaments; forming a large clump attached on a substrate (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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Branching rare at the base, numerous at anterior ends forming tuft
C. pisiformis or C. attenuata ? μm Nagaike park Hachioji Tokyo, 2005	C. pisiformis ? μm Japan, 2000	C. pisiformis ? μm Akasaka-numa Iwatsuki-ku Saitama, 2006
Di- or trichotomous branching uniformly occurs throughout whole filaments
C. elegans 7-20 x 5-7 μm Iyari marsh Omachi Nagano, 2006	C. elegans ? μm Numa-no-hara m. Madarao highland Niigata, 2005	C. elegans or Cloniophora ? μm Japan, 1999	Chaetophora sp. ? μm Yoshikawa Saitama, 2003
Chaetophora sp. ? or Draparnaldia? μm Ichinose-enchi Norikura highland Nagano, 2005	Chaetophora sp. ? 7-12 x 12 μm Kawaguchi n.p. Kawaguchi city Saitama, 2005	Chaetophora sp. ? or Cloniophora ? 12 x 8 μm Shirakobato w.p. Koshigaya Saitama, 2005

Similar Genus -> Cloniophora; Cladophora;

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