Protist Images: Pediastrum duplex

Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum duplex
Meyen

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. duplex - var. reticulatum
Space present at the center of colonies A cell located at the center of colonies

var. duplex
5 samples
16-cells
16 = 11+5
1998-2004
var. duplex
5 samples
16-cells
16 = 11+5
1998-2004
var. duplex
17 samples
32-,16-, 8-cells
16 = 10+5+1
1997-2006
var. duplex
17 samples
32-,16-, 8-cells
16 = 10+5+1
1997-2006

var. reticulatum
8 samples
32 = 16+10+5+1
199?-2005
var. reticulatum
8 samples
32-, 16-, 8-cells
16 = 10+5+1
199?-2005
var. reticulatum
8 samples
16 = 10+5+1
Umi-no-nakamichi
199?-2005
var. reticulatum
8 samples
32-, 16-cells
8 = 7+1
199?-2005
var. gracilimum

var. gracilimum
19 samples
32-cells
2001-2004
var. gracilimum
19 samples
32-cells
2001-2004
var. gracilimum
19 samples
stock Tmz-52
2001-2004
var. gracilimum
19 samples
2001-2004
var. rugulosum: Cell surface wrinkled and/or granulated

var. rugulosum
9 samples
32 = 16+10+5+1
1999-2005
var. rugulosum
9 samples
32 = 16+10+5+1
1999-2005
var. rugulosum
9 samples
32 = 16+10+5+1
1999-2005
var. rugulosum
9 samples
32 = 16+10+5+1
1999-2005
var. rotundatum: Horn-like processes swelled

var. rotundatum
5 samples
16-cells
16 = 10+5+1
1998-2001
var. rotundatum
5 samples
16-cells
16 = 10+5+1
1998-2001
var. rotundatum
5 samples
32-, 16-cells
16 = 10+5+1
1998-2001
var. rotundatum
5 samples
15-cells ?
1998-2001

Similar species -->> P. angertiniense

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var. duplex - var. reticulatum
Space present at the center of colonies		A cell located at the center of colonies
var. duplex 5 samples 16-cells 16 = 11+5 1998-2004	var. duplex 5 samples 16-cells 16 = 11+5 1998-2004	var. duplex 17 samples 32-,16-, 8-cells 16 = 10+5+1 1997-2006	var. duplex 17 samples 32-,16-, 8-cells 16 = 10+5+1 1997-2006
var. reticulatum 8 samples 32 = 16+10+5+1 199?-2005	var. reticulatum 8 samples 32-, 16-, 8-cells 16 = 10+5+1 199?-2005	var. reticulatum 8 samples 16 = 10+5+1 Umi-no-nakamichi 199?-2005	var. reticulatum 8 samples 32-, 16-cells 8 = 7+1 199?-2005
var. gracilimum
var. gracilimum 19 samples 32-cells 2001-2004	var. gracilimum 19 samples 32-cells 2001-2004	var. gracilimum 19 samples stock Tmz-52 2001-2004	var. gracilimum 19 samples 2001-2004
var. rugulosum: Cell surface wrinkled and/or granulated
var. rugulosum 9 samples 32 = 16+10+5+1 1999-2005	var. rugulosum 9 samples 32 = 16+10+5+1 1999-2005	var. rugulosum 9 samples 32 = 16+10+5+1 1999-2005	var. rugulosum 9 samples 32 = 16+10+5+1 1999-2005
var. rotundatum: Horn-like processes swelled
var. rotundatum 5 samples 16-cells 16 = 10+5+1 1998-2001	var. rotundatum 5 samples 16-cells 16 = 10+5+1 1998-2001	var. rotundatum 5 samples 32-, 16-cells 16 = 10+5+1 1998-2001	var. rotundatum 5 samples 15-cells ? 1998-2001