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

Klebsormidium flaccidum
(Kützing) S. Mattox et Blackwell
Syn.: Hormidium flaccidum (Kützing) Braun

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).
Species: cell body cylindrical or somewhat laterally swelled, 6-12 μm long, 8-12 μm wide; a single chloroplast plate-like, parietal covering half of the cell wall, with a pyrenoid (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body more than 8 μm in diam.
K. flaccidum ? or Ulothrix ? 11-18 x 12.5 μm Numa-no-hara m. Madarao highland Niigata, 2005	K. flaccidum 9-24 x 10 μm Japan, 1998	K. flaccidum ? or Ulothrix ? x 10 μm Tokorozawa Saitama, 2002	K. flaccidum ? or Ulothrix ? x 9-10 μm Iruma Saitama, 2002
K. flaccidum x 10 μm Numappara marsh Kuroiso Tochigi, 2003	K. flaccidum ? x 6-12 μm Watarase river Ashikaga Tochigi, 2003	K. flaccidum 15-20 x 10 μm Iroha-numa Zao mountain Yamagata, 2005

Similar Genus ->> Ulothrix

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