Protist Images: Pediastrum duplex

Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum duplex
Meyen var. rugulosum

Species: Colonies of 8-32 (rarely 4, 64 or 128 cells) with large intercellular space; inner cells H or X-shaped, trapezoid to rectangular when matured; outer half of the marginal cells prolonged into two horn-like processes with a tuft of long bristles; daughter colonies formed in a vesicle released from mother cell; cell wall smooth (Photomicrographs of the fresh-water algae, 1994).

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Cell surface wrinkled and/or granulated

var. rugulosum
stock Ton, axenic
32 = 16+10+5+1
Tochigi, 2000
var. rugulosum
stock Ton-3
32 = 15+10+6+1
Tochigi, 2000
var. rugulosum
stock Ton-3
32 = 15+10+6+1
Tochigi, 2000
var. rugulosum ?
or other var.
32-cells
32 = 16+10+5+1
Saitama, 1999

var. rugulosum
-cells
O-ike park
Yabuki
Fukushima, 2003
var. rugulosum
or P. boryanum ?
Omine-numa
Tsukiyono
Gunma, 2003
var. rugulosum
65, 90 μm φ
Kabuto-yama
Nishi-no-miya
Hyogo, 2004
var. rugulosum
128 μm φ
Kabuto-yama
Nishi-no-miya
Hyogo, 2004

var. rugulosum
90 μm φ
Kabuto-yama
Nishi-no-miya
Hyogo, 2004
var. rugulosum
100, 106 μm φ
near Yamaguchi Univ.
Yamaguchi, 2004
var. rugulosum
80, 100 μm φ
Hasu-ike
Shiga highland
Nagano, 2005
var. rugulosum
80 μm φ
Futayo-no-ike
Haguro mountain
Yamagata, 2005

Similar species -->> P. angertiniense

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Cell surface wrinkled and/or granulated
var. rugulosum stock Ton, axenic 32 = 16+10+5+1 Tochigi, 2000	var. rugulosum stock Ton-3 32 = 15+10+6+1 Tochigi, 2000	var. rugulosum stock Ton-3 32 = 15+10+6+1 Tochigi, 2000	var. rugulosum ? or other var. 32-cells 32 = 16+10+5+1 Saitama, 1999
var. rugulosum -cells O-ike park Yabuki Fukushima, 2003	var. rugulosum or P. boryanum ? Omine-numa Tsukiyono Gunma, 2003	var. rugulosum 65, 90 μm φ Kabuto-yama Nishi-no-miya Hyogo, 2004	var. rugulosum 128 μm φ Kabuto-yama Nishi-no-miya Hyogo, 2004
var. rugulosum 90 μm φ Kabuto-yama Nishi-no-miya Hyogo, 2004	var. rugulosum 100, 106 μm φ near Yamaguchi Univ. Yamaguchi, 2004	var. rugulosum 80, 100 μm φ Hasu-ike Shiga highland Nagano, 2005	var. rugulosum 80 μm φ Futayo-no-ike Haguro mountain Yamagata, 2005