Order: Uninucleate filamentous algae without branching; cell body mostly cylindrical; all cells can divide; chloroplasts parietal with one or more pyrenoids; asexual reproduction by fragmentation of algae or formation of zoospores with two or four flagella; usually eyespot present; sexual reproduction by isogamy, anisogamy or oogamy
Family: Chloroplasts plate-like or ribbon-like; sexual reproduction by isogamy.
Genus: Without gelatinous sheath; filaments consist of many cells; rhizoid formed at one end (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body more than 20 μm in diam.
Ulothrix sp. x 27-47 μm Matsumoto Nagano, 2001	Ulothrix sp. x 23 μm Iruma Saitama, 2001	U. zonata x 57-65 μm riverside park Kuroiso Tochigi, 2005	U. zonata 30 x 45 μm Azami-numa Iwajuku Gunma, 2006
U. zonata x 20-43 μm Ujiie (Sakura) Tochigi, 2001	U. zonata x 32 μm Moroyama Saitama, 2003	U. zonata 12-20 x 35 μm Akagi forest p. Fujimi Gunma, 2005	U. tenuissima ? 11 x 35 μm Yamagata, 1999
Ulothrix sp. x 25-32 μm Tama river Komae Tokyo, 2004	Ulothrix sp. x 29 μm Iruma river Sayama Saitama, 2004	Ulothrix sp. x 23-28 μm Kinu-gawa g.p. Takanezawa Tochigi, 2004	Ulothrix sp. ? 5-18 x 35-40 μm Usui river Takasaki Gunma, 2004
Ulothrix sp. x 28 μm Isa-numa Kawagoe Saitama, 2008
Cell body 10-20 μm in diam.
Ulothrix sp. or Geminella ? or Microspora ? x 20 μm Nishi-Urawa Saitama, 2001	Ulothrix sp. x 15-17 μm Kido-ike Shiga highland Nagano, 2006	Ulothrix sp. x 13-14 μm Kiyose Tokyo, 2001	Ulothrix sp. 7-10 x 13 μm Nanbata-shinden Fujimi Saitama, 2004
Ulothrix sp. x 13-16 μm Iruma river Sayama Saitama, 2004	Ulothrix sp. x 14-17 μm Kuroiso Tochigi, 2001	Ulothrix sp. or Klebsormidium ? 6-17 x 18 μm Japan, 1998	Ulothrix sp. 12-15 x 14 μm Usui river Takasaki Gunma, 2004
Ulothrix sp. or Klebsormidium ? 7-15 x 16 μm Japan, 1998	Ulothrix sp. x 8-12 μm Kuroiso Tochigi, 2001	Ulothrix sp. or Klebsormidium ? 7-13 x 9-10 μm Oyomi marsh Japan, 1998
Cell body less than 10 μm in diam.
Ulothrix sp. ? 18-25 x 7-9 μm Ara-kawa Kumagaya Saitama, 2004	Ulothrix sp. 5-11 x 7 μm Japan, 1997	Ulothrix sp. μm Mizuko Fujimi Saitama, 2003	Ulothrix sp. or Klebsormidium ? 16-17 x 9 μm Kurome river Asaka Saitama, 2004
Ulothrix sp. or Klebsormidium ? x 9 μm Numa-no-hara m. Madarao highland Niigata, 2005
Ulothrix sp.5 or Klebsormidium ? 3-6 x 5 μm Japan, 1998	Ulothrix sp.5 or Klebsormidium ? x 4.6 μm Japan, 1998	Ulothrix sp.5 x μm Mizuko Fujimi Saitama, 2003	Ulothrix sp.5 ? or Klebsormidium ? cell μm Japan, 1998
???
Ulothrix sp. ? 9-11 μm φ pyrenoids present Kiyose Tokyo, 2001	Ulothrix sp. ? 5-10 x 7 μm pyrenoids present Sanda Hyogo, 2001	Ulothrix sp. ? 9-18 x 6 μm pyrenoids present Sayama Natural p. Saitama, 2001	Ulothrix sp. ? 10-18 x 5.5 μm pyrenoids present Sanda Hyogo, 2001

Similar Genus ->> Klebsormidium; Geminella;

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