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Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum tetras
(Ehrenberg) Ralfs, 1844

Genus: Colonies of a fixed number of cells, flat, circular in shape; cell body polygonal in shape, with horn-like projections; cell wall garanulated, wrinkled or notched; chloroplasts plate-like or reticular; asexual reproduction by zoospore; sexual reproduction by isogametes (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Colonies without perforations, 12-74 μm in diam.; all cells with a deep incision, cell wall smooth ; marginal cells with two triangular processes extending outward, triangular (colonies with small number of cells) or trapezoid (large colonies) at base, 5-18 μm in diam., 4-18 μm long; inner cells five to seven angled, 4-16 μm in diam., 4-14 μm long (Photomicrographs of the Freshwater Algae, vol. 5, 1986).
Google Image Search
Pediastrum tetras
v. tetras
16 = 11 + 5
N/L=0.50
Mizumoto park
Tokyo, 2001
Pediastrum
v. tetras
8 = 7 + 1
N/L=0.40
Japan, 1998
Pediastrum
v. tetras
8 = 7 + 1
N/L=4.5
Mashiko
Tochigi, 1999
Pediastrum tetras
v. tetras
8 = 7 + 1
Ohnuma
Nasu-shiobara
Tochigi, 2007
Pediastrum tetras
v. tetras
16 = 11 + 5
Nashi-ike
Kagami-ishi
Fukushima, 2003
Pediastrum tetras
v. tetras
16 = 11 + 5
8 = 7 + 1
O-ike park
Yabuki
Fukushima, 2003

v. tetras
16 = 11 + 5
N/L=0.45
Uruguay, 1999
Pediastrum
P. tetras
or P. obtusum ?
16-, 8-, 4-cells
16 = 11 + 5
N/L=
Uruguay, 1999
Pediastrum tetras
v. tetras
8 = 7 + 1
N/L=
Sayama Natural p.
Tokyo, 2001
Pediastrum tetras
v. tetras
8 = 7 + 1
Yakebe-ike
Sayama Natural p.
Tokyo, 2006
Pediastrum tetras
v. tetras
16 = 11 + 5
8 = 7 + 1
N/L=
Nasu
Tochigi, 2001
Pedastrum tetras
v. tetras
16 = 11 + 5
N/L=
Mizumoto Park
Tokyo, 2001
Pediastrum
v. tetras
16 = 11 + 5
N/L=0.50
Japan, 1998
Movies
Pediastrum tetras
v. tetras
8 = 7 + 1
N/L=0.44
Shikinawa-ike
Fukuoka, 2001
P. tetras
8 = 7 + 1
Higashi-hiroshima
Hiroshima, 1998
Pediastrum tetras
v. tetras
8 = 7 + 1
Tane-ike
Togakushi highland
Nagano, 2005
Pediastrum tetras
v. tetras
8 = 7 + 1
Hasu-ike
Shiga highland
Nagano, 2005
Pediastrum tetras
v. tetras
8 = 7 + 1
Futayo-no-ike
Haguro mountain
Yamagata, 2005
Pediastrum
v. tetraodon
8 = 7 + 1
N/L=0.56
Saitama, 1999
Pediastrum tetras
P. tetras
var. tetraodon
16 = 11 + 5
N/L=0.55
Tsuchiura
Ibaraki, 2002
Pediastrum tetras
v. tetraodon ?
8 = 7 + 1
N/L=0.56
Wan-park-land
Kochi, 2002
Pediastrum tetras
v. tetraodon ?
16 = 11 + 5
N/L=0.63
Tatebayashi
Gunma, 2001
P. tetras
16 = 11 + 5
Kurome river
Asaka
Saitama, 1998
Pediastrum tetras
v. tetraodon ?
8 = 7 + 1
N/L=
Chichibu
Saitama, 2003
Pediastrum tetras
v. tetraodon ?
8 = 7 + 1
N/L=
Aobano-mori Park
Chiba, 2003
Pediastrum tetras
v. tetraodon ?
N/L=
Ranzan
Saitama, 2004
Pediastrum tetras
P. tetras
var. tetraodon ?
8 = 7 + 1
N/L=
Chiba-Minato Park
Chiba, 2003
Pediastrum tetras
P. tetras
N/L=
Zenko-ji
Nagano, 2003
Pediastrum tetras
P. tetras
N/L=
Naruto
Chiba, 2003
Pediastrum tetras
P. tetras
N/L=
near City Hall
Fujimi
Saitama, 2004
Pediastrum tetras
P. tetras
N/L=
Higashi-sano
Hakuba
Nagano, 2004
Pediastrum tetras
P. tetras
N/L=
Nozomiko 2
Iiyama
Nagano, 2007
Pediastrum tetras
v. tetraodon
N/L=
water reservoir
near Yamaguchi Univ.
Yamaguchi, 2004
Pediastrum tetras
v. tetraodon
N/L=
Aizu Recreation p.
Aizuwakamatsu
Fukushima, 2005
Colony of 4 cells
Pediastrum tetras
v. tetras
or v. tetraodon ?
colonies of 4 cells
Kabuto-yama
Nishi-no-miya
Hyogo, 2004
Pediastrum tetras
v. tetras ?
colonies of 4 cells
water reservoir
near Yamaguchi Univ.
Yamaguchi, 2004
Pediastrum biradiatum
v. tetras ?
N/L=
Higusa-numa
Hikari
Chiba, 2003
Pediastrum tetras
v. tetras ?
N/L=
Tane-ike
Togakushi highland
Nagano, 2005
Pediastrum tetras
v. tetraodon
colonies of 4 cells
Ushijima park
Kasukabe
Saitama, 2003
Pediastrum tetras
v. tetraodon ?
stock Sksu-1
colonies of 4 cells
Ushijima park
Kasukabe
Saitama, 2003
Pediastrum tetras
v. tetraodon ?
μm
near Yamaguchi Univ.
Yamaguchi, 2004
Pediastrum tetras
v. tetraodon ?
17 μm
Nagaike park
Hachioji
Tokyo, 2005
v. tetraodon ?
Higashi-hiroshima
Hiroshima, 1998
Pediastrum
P. tetras ?
N/L=
Tsugaike highland
Otari
Nagano, 2006

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Pediastrum tetras
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