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Chlorophyceae: Chlorococcales: Scenedesmaceae

Crucigenia
Morren

Family: Colonies of a fixed number of cells (4, 8, 16, 32, or more) arranged 2- or 3-dimensionally; cells spherical, ellipsoidal, polygonal, etc. in shape; chloroplasts 1 or several, plate-like in shape, with 1 pyrenoid; asexual reproduction by autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Arrangement of 4 daughter cells flat and rectangular in shape, forming composite coenobium; without gelatinous sheaths, no hairly projections (Illustrations of the Japanese Freshwater Algae, 1977).
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Cell body ellipsoidal - ovoidal - spherical in shape
Crucigenia neglecta
C. rectangularis
11 x 6 μm
7 x 4 μm
Tsukuba
Ibaraki, 2002
Crucigenia
C. lauterbornii
9.5 x 8 μm
Japan, 2000
Crucigenia quadrata
C. quadrata
6 x 3.5 μm
Toneri Park
Tokyo, 2001
xxxx
C. quadrata ?
6 x 3.5-5 μm
Maruyama Park
Ageo
Saitama, 2002
Crucigenia quadrata
C. quadrata ?
5-6 x 4-5 μm
Watarase river
Ashikaga
Tochigi, 2004
Crucigenia quadrata
C. quadrata
4.5-6 x 4-5 μm
near Yamaguchi Univ.
Yamaguchi, 2004
Crucigenia
C. quadrata ?
μm
Kareki-numa
Nikko
Tochigi, 2008
Cell body slightly curved
C. crucifera: 13 samples
Crucigenia
C. crucifera
9.5 x 4.7 μm
Ueno
Tokyo, 2001
Crucigenia crucifera
C. crucifera
6 x 4 μm
Bessho numa
Saitama, 2001
Crucigenia
C. crucifera
7 x 4.5 μm
Mizumoto park
Tokyo, 2001
Crucigenia
C. crucifera
7 x 4.5 μm
Abiko
Chiba, 2000
Cell body triangular in shape
C. tetrapedia: 6 samples
Crucigenia
C. tetrapedia
cell 5.5 x 2.3 μm
colony 16 μm
Ueno
Tokyo, 2001
Crucigenia tetrapedia
C. tetrapedia
3 x 4 μm
colony 12 μm
Nishi-Urawa
Saitama, 2001
Crucigenia
C. tetrapedia
5 x 6 μm
Mizumoto park
Tokyo, 2001
Crucigenia tetrapedia
C. tetrapedia
μm
Higusa-numa
Hikari
Chiba, 2003
Crucigenia
C. fenestrata ?
or Tetrastrum ?
4.5 x 3 μm
Ueno
Tokyo, 2001
Crucigenia fenestrata
C. fenestrata
15 x 13 μm
Omine-numa 6
Minakami
Gunma, 2007
Crucigenia fenestrata
C. fenestrata
μm
Karayama-ike
Iiyama
Nagano, 2008

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Crucigenia
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