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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Similar species -->> P. angertiniense
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