Species: Cell body cylindrical, slightly depressed at center, 68-185 μm long, 14-22 μm wide; chloroplasts with longitudinal ridges; cell wall with small granules arranged longidudinally or sometimes irregularly; zygospores spherical or slightly elongated (Photomicrographs of the Fresh-water Algae, 1985).

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P. margaritaceum 153,193 x 21,22 μm L/W= 7.3,8.8 Maimeno-ike Norikura highland Nagano, 2006	P. margaritaceum 202 x 23 μm L/W= 8.8 Azami-ike Norikura highland Nagano, 2006	P. margaritaceum 159 x 28 μm L/W= 5.7 Kotoku-numa Nikko Tochigi, 2006
P. margaritaceum 168 x 24 μm 144 x 22 μm L/W= 6.5-7.0 Hiroshima, 1998 Movies	P. margaritaceum 195 x 24 μm L/W= 8.0 Saitama, 1999	P. margaritaceum 92 x 22 μm 101 x 22 μm 130 x 22 μm L/W= 4.2-5.9 Saitama, 1999	P. margaritaceum 130 x 24 μm 145 x 19 μm 131 x 19 μm 203 x 17 μm 96 x 20 μm Tsukuba Ibaraki, 2000
P. margaritaceum stock Ikk-2, axenic 117-140 x 20 μm L/W= 5.9-7.1 Kaga Ishikawa, 2000	P. margaritaceum stock Ikk-2, axenic conjugation Kaga Ishikawa, 2000	P. margaritaceum stock Ikk-1 Cell division Kaga Ishikawa, 2000	P. margaritaceum stock Ffu-2 94 x 20 μm Umi-no-nakamichi Fukuoka, 2001
P. margaritaceum 177 x 21 μm Kasuga Fukuoka, 2001	P. margaritaceum 89 x 28 μm Kayoicho-ike Fukuoka, 2001	P. margaritaceum stock Tts-1 Cell division Showa Memorial p. Tokyo, 2001	P. margaritaceum μm Michi-no-eki Tsukiyono Gunma, 2003
P. margaritaceum μm Numappara marsh Kuroiso Tochigi, 2003	P. margaritaceum μm Mizuko Fujimi Saitama, 2003	P. margaritaceum 120-150 x 20-22 μm Iruma river Sayama Saitama, 2004	P. margaritaceum 168 x 27 μm near City Hall Fujimi Saitama, 2004
P. margaritaceum 194 x 27 μm Kahan koen Kuroiso Tochigi, 2004	P. margaritaceum 126 x 23 μm L/W=5.5 Higashi-sano Hakuba Nagano, 2004	P. margaritaceum 132 x 21 μm L/W=6.3 Higashi-sano Hakuba Nagano, 2004	P. margaritaceum 135 x 22 μm L/W=6.1 Tsukamoto Sakura-ku Saitama, 2004
P. margaritaceum 155 x 19 μm Kusatsu Onsen b.t. Kusatsu Gunma, 2005	P. margaritaceum 155 x 19 μm Kashibaru m.6 Karatsu Saga, 2006	P. margaritaceum μm n. Yamakado m. Nishi-Azai Shiga, 2008	P. margaritaceum μm n. Yamakado m. Nishi-Azai Shiga, 2008
P. margaritaceum μm n. Lake Nakatsuna Omachi Nagano, 2008

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