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

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Klebsormidium
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