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: Marginal cells with a single, long horn-like process (Photomicrographs of the Freshwater Algae, vol. 8, 1988).

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Intercellular space present: Cell surface with short hairs or granulated
var. simplex 8 cells Kawashima or Kawajima Saitama, 2002	var. simplex ? Kawashima or Kawajima Saitama, 2002	var. simplex ? hairly struct. Kawashima or Kawajima Saitama, 2002	var. simplex Showa-machi g.p. Showa Saitama, 2003
Intercellular space present: Cell surface smooth
var. duodenarium 32 cells Nishi-Urawa Saitama, 2001	var. duodenarium 32 cells Koshigaya Saitama, 2001	var. duodenarium 16 or 32 cells Koshigaya Saitama, 2001	var. duodenarium stock Skg-11 Koshigaya Saitama, 2001
var. duodenarium colony μm Otto-Numa Tsuchiura Ibaraki, 2002	var. duodenarium colony 150 μm Minuma Natural p. Midori-ku Saitama, 2006	var. duodenarium colony μm Suzukake-dai Sanda Hyogo, 2001	var. duodenarium colony 85 μm Kondo-numa p. Tatebayashi Gunma, 2006
var. duodenarium colony μm Saiko Toda Saitama, 2005	var. duodenarium colony μm Saiko Toda Saitama, 2007	var. duodenarium colony μm Saiko Minami-ku Saitama, 2007
var. duodenarium colony μm Umi-no-nakamichi Fukuoka Fukuoka, 2001	var. duodenarium colony 60 μm Mizumoto Park Katshika-ku Tokyo, 2006	var. duodenarium colony μm Shimonta-ike Showa-no-mori Chiba, 2007	var. duodenarium colony μm Kashiwa v.m.p. Kashiwa Chiba, 2008
var. duodenarium or P. biwae ? Shikinawa-ike Fukuoka, 2001	var. duodenarium or P. biwae ? 107 μm φ Lake Sai Toda Saitama, 2004	var. duodenarium or P. biwae ? 80 μm φ Sakitama-kofun p. Gyoda Saitama, 2004	var. duodenarium or P. biwae ? 130 μm φ Ukima Park Kita-&Itabashi-ku Tokyo, 2005
var. duodenarium Oh-asoh Kumagaya Saitama, 2004	var. duodenarium Kawashima or Kawajima Saitama, 2002	var. duodenarium 8 cells Japan, 1997	var. duodenarium 32 cells Saitama, 1999
Intercellular space absent: Cell surface with short hairs or granulated
var. echinulatum ? Kawashima or Kawajima Saitama, 2002	var. echinulatum ? 8 cells ? Saitama, 1999	var. echinulatum 8 cells Saitama, 1999	var. echinulatum 8 cells Kawashima or Kawajima Saitama, 2002
var. echinulatum 8 cells Omiya Saitama, 2001	var. echinulatum 8 cells Mizumoto Park Tokyo, 2001	var. echinulatum 8 cells Musashi-Urawa Saitama, 2001	var. echinulatum 16 cells Kiyose Tokyo, 2001
var. echinulatum space present ? 32 cells Kiyose Tokyo, 2001	var. echinulatum 4 cells Saitama, 1999	var. echinulatum Umi-no-nakamichi Fukuoka, 2001	var. echinulatum Sue-machi Fukuoka, 2001
var. echinulatum 8, 16 cells Nanbata castle p. Fujimi Saitama, 2005	var. echinulatum colony 90 μm Showa-machi g. p. Showa Saitama, 2006	var. echinulatum colony 51 μm Shiroyama Park Okegawa Saitama, 2006	var. echinulatum colony 60 μm Saitama studium Midori-ku Saitama, 2006
var. echinulatum colony 52 μm Oura central p. Oura Gunma, 2006
Intercellular space absent: Cell surface smooth
var. echinulatum 8 cells Mizumoto Park Tokyo, 2001	var. echinulatum colony 50 μm 8 cells Mizumoto Park Tokyo, 2006	var. echinulatum 8 cells Bessho-Numa Saitama, 2001

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