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Gamophyceae: Zygnematales: Zygnemataceae

Zygnema
Agardh 1824

Family: Filamentous algae without branching; cell body cylindrical; chloroplasts band-, plate- or star-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Filament without branching; cell body cylindrical; two chloroplasts star-shaped; tubes formed (or cell body fused) at conjugation; zygospore spherical or broad ellipsoidal formed within female gametangium (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). About 100 species (Illustrations of The Japanese Fresh-water Algae, 1977).
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Cell body more than 30 μm in diam.
Zygnema
Zygnema sp.
62 x 44 μm
Tsukuba
Ibaraki, 2000
Zygnema
Zygnema sp.
53-60 x 42 μm
Yasuji-kawa
Sawara
Chiba, 2004
Zygnema
Zygnema sp.
127 x 40 μm
Tsukuba
Ibaraki, 2000
Zygnema
Zygnema sp.
48-90 x 40 μm
Minuma-no-numa
Omiya daisan p.
Saitama, 2005
Zygnema
Zygnema sp.
x 37 μm
Fujioka
Tochigi, 2001
Zygnema
Zygnema sp.
74 x 35 μm
Japan, 1998
Zygnema
Z. pectinatum
40-60 x 35 μm
Omiya-showa
Saitama
Saitama, 2005
Zygnema
Zygnema sp.
74 x 35 μm
Japan, 1998
Zygnema
Zygnema sp.
x 37 μm
Takamatsu
Kagawa, 2002
Zygnema
Zygnema sp.
x μm
Ishinazaka
Furukawa
Miyagi, 2003
Zygnema
Zygnema sp.
x 36 μm
Water field
Yuri-Honjo
Akita, 2008
Zygnema
Z. cruciatum
or Z. fanicum ?
x 32 μm
Shinagawa
Tokyo, 2003
Zygnema
Zygnema sp.
x μm
Motono
Chiba, 2003
Zygnema
Zygnema sp.
6-104 x 33 μm
Kinu river
Takanezawa
Tochigi, 2004
Zygnema
Zygnema sp.
6-104 x 33 μm
Univ. A.V.M.
Obihiro
Hokkaido, 2005
Zygnema
Zygnema sp.
x 30 μm
Ikenokochi marsh
Tsuruga
Fukui, 2004
Zygnema
Zygnema sp.
x 31 μm
Nakano-numa p.
Oura
Gunma, 2006
Cell body less than 30 μm in diam.
Zygnema
Z. fanicum
x 28 μm
Kawashima
or Kawajima
Saitama, 2002
Zygnema
Zygnema sp.
x 28 μm
Iwatsuki
Saitama, 2002
Zygnema
Zygnema sp.
x 27 μm
Hasuda
Saitama, 2002
Zygnema
Z. normani ?
x 25.5 μm
Fukasaku-gawa Y.
Saitama, 2002
Zygnema
Z. normani ?
37-75 x 26 μm
Kamishiro
Hakuba
Nagano, 2004
Zygnema
Z. normani ?
36-42 x 25 μm
near Takao-sakura p.
Kitamoto
Saitama, 2005
Zygnema
Zygnema sp.
x 26 μm
Ishinazaka
Furukawa
Miyagi, 2003
Zygnema
Zygnema sp.
x 26 μm
Kitayama park
Higashi-Murayama
Tokyo, 2004
Zygnema
Zygnema sp.
x 26 μm
Minuma-no-numa
Omiya daisan p.
Saitama, 2005
Zygnema
Zygnema sp.
23-47 x 26 μm
Satsunai river
Obihiro
Hokkaido, 2005
Zygnema
Zygnema sp.
x 24 μm
Motono
Chiba, 2003
Zygnema
Zygnema sp.
x 25 μm
Saitama, 1999
Zygnema
Zygnema sp.
65-74 x 25 μm
gelatinous sheath
Fujioka
Tochigi, 2001
Zygnema
Zygnema sp.
46-102 x 24 μm
Japan, 1998
Zygnema
Zygnema sp.
x 25 μm
Tone river
Tsukiyono
Gunma, 2003
Zygnema
Zygnema sp.
71 x 25 μm
Takao-sakura p.
Kitamoto
Saitama, 2005

Zygnema sp.
x 23 μm
Tsukuba
Ibaraki, 2000

Zygnema sp.
x 23 μm
gelatinous sheath
Kaga
Ishikawa, 2000
Zygnema
Zygnema sp.
x 23-20 μm
Lake Shirakaba
Tateshina & Chino
Nagano, 2005
Zygnema
Zygnema sp.
x 21 μm
near Oyomi marsh
Hakuba
Nagano, 2004
Zygnema
Zygnema sp.
x 22.5 μm
Kitayama park
Higashi-Murayama
Tokyo, 2006
Zygnema
Zygnema sp.
x 22 μm
Yakebitai mt.
Shiga highland
Nagano, 2006
Zygnema
Zygnema sp.
40 x 20 μm
USA, 1999
Zygnema
Zygnema sp.
x 19 μm
gelatinous sheath
Senjo-ga-hara
Nikko
Tochigi, 2003
Zygnema
Zygnema sp.
x 19 μm
Karasu river
Takasaki
Gunma, 2004
Zygnema
Zygnema sp.
x 19 μm
Kodanuki marsh
Fujinomiya
Shizuoka, 2006
Zygnema
Zygnema sp.
38 x 18 μm
gelatinous sheath
Sanda
Hyogo, 2001
Zygnema
Zygnema sp.
x 17.5 μm
Imou bog 2
Toyohashi
Aichi, 2006
Mougeotia
Zygnema sp.
x 16 μm
gelatinous sheath
Takamatsu
Kagawa, 2002
Zygnema
Zygnema sp.
x 15 μm
gelatinous sheath
Takamatsu
Kagawa, 2002
Zygnema
Zygnema ?
or Cylindrocystis ?
Toneri Park
Tokyo, 2001
Similar genus --> > Cylindrocystis;

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Zygnema
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