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).

Google Image Search

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

Similar species -->> P. angertiniense

Please click on species name for more images.

Copyright Protist Information Server