Species: Cells 8-17 μm; colony 20-50 μm to 250 μm; 16 cells as a tight sphere within clear matrix (How to know the protozoa, 1979). Colony barrel-shaped, 8- or 16-celled; cells wedge-shaped; chloroplast longitudinally striated; colony 20-42 μm across, 60 μm long; cells 8-17 μm diam. (Illustrated Guide, 1985). Sexual reproduction by isogamy (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000). Sexual reproduction by iso- or anisogamy (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

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Cell contains only one pyrenoid
P. morum col. 51 x 40 μm Furuyakami Kawagoe Saitama, 2004	P. morum col. 37 x 31 μm Isa-numa Kawagoe Saitama, 2001	P. morum col. 40 x 34 μm Aina-shinsui Park Kawagoe Saitama, 2002	P. morum col. 42 x 37 μm cells μm Kurihashi Saitama, 2001
P. morum col. μm Shimo-yanagi Showa Saitama, 2003	P. morum col. μm Koyama River Kodama Saitama, 2003	P. morum col. 37 x 33 μm cells μm Saitama, 1999	P. morum ? col. 56 x 47 μm cells μm Saitama, 1999
P. morum ? dividing cells col. 30 x 25 μm Binnuma river Saitama, 2000 Movies	P. morum col. μm Shimo-takatsu Tsuchiura Ibaraki, 2003	P. morum col. μm Shimo-takatsu Tsuchiura Ibaraki, 2003	P. morum col. 48 x 37 μm cells μm Matsumoto Nagano, 2001
P. morum st. Ngm-1, axenic col. 46 x 39 μm Matsumoto Nagano, 2001	P. morum ? col. 28 x 23 μm cells μm Tatebayashi Gunma, 2001	P. morum ? col. 46 x 40 μm cells μm Japan, 1998	P. morum ? col. μm cells μm Zenko-ji Nagano, 2003
P. morum ? col. 41 x 34 μm cells μm Uruguay, 1999	P. morum ? col. μm Mizuko Fujimi Saitama, 2003	P. morum col. 45 x 35 μm Kawanago Ishibashi Tochigi, 2004	P. morum & st. Skmo-4 col. 40 x 35 μm Oh-asoh Kumagaya Saitama, 2004
P. morum col. μm Benten-ike Higashi-Murayama Tokyo, 2004	P. morum colony inversion Tama river Komae Tokyo, 2004	P. morum stock Gtap-1 col. 36 x 33 μm Takasaki p. Takasaki Gunma, 2004	P. morum col. 42 x 33 μm col. 53 x 45 μm Ranzan Saitama, 2004
P. morum col. 50 x 37 μm Ranzan Saitama, 2004	P. morum col. 44 x 35 μm Ikenokochi marsh Tsuruga Fukui, 2004	P. morum col. 50 x 40 μm Noda Higashi-matsuyama Saitama, 2004	P. morum col. 46 x 38 μm Shimo-muneoka Shiki Saitama, 2004
P. morum col. 34 x 30 μm Senuki Nasu Saitama, 2004	P. morum col. 26 x 23 μm Asa-kawa Hachioji Tokyo, 2005	P. morum ? or P. colemaniae ? col. 26 x 23 μm Atago Park Iruma Saitama, 2005	P. morum col. 37,57 x μm Kowashimizu Suwa Nagano, 2005
P. morum col. 45 x 38 μm Heisei-no-mori p. Kawajima Saitama, 2006	P. morum col. 40 x 34 μm near Shinrin-koen Namegawa Saitama, 2006	P. morum col. 33 x 30 μm Koyama River Honjo Saitama, 2006

Similar genus -> > Yamagishiella

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