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Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum duplex
Meyen var. reticulatum

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 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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var. reticulatum
Pediastrum duplex
var. reticulatum
32 = 16+10+5+1
Kijioka Castle Ruin
Kodama town
Saitama, 2003
Pediastrum
var. reticulatum
32-, 16-, 8-cells
16 = 10+5+1
Japan, 199?
Pediastrum duplex
var. reticulatum
16 = 10+5+1
Umi-no-nakamichi
Fukuoka, 2001
Pediastrum
var. reticulatum ?
32-, 16-cells
8 = 7+1
Tochigi, 2001
Pediastrum duplex
var. reticulatum ?
8-cells
8 = 6 +2
Japan, 2004
Pediastrum duplex
var. reticulatum ?
-cells
Noda
Namegawa
Saitama, 2004
Pediastrum duplex
var. reticulatum
16-cells
near Ayu river
Fujioka
Gunma, 2004
Pediastrum duplex
var. reticulatum
32-cells
Tane-ike
Togakushi highland
Nagano, 2005
Similar species -->> P. angertiniense

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Pediastrum duplex
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