Family:
Genus:
Species: Cell body 50-170 μm long, 10-30 μm wide (Süßwasserflora von Mitteleuropa 2/1, Bacillariophyceae 1, 1997).

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P. viridis 155 x 27 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005	P. viridis 152 x 27 μm Kannon-numa Shimogo Fukushima, 2005	P. viridis 145 x 25 μm Tanohara marsh Shiga highland Nagano, 2004	P. viridis 141 x 26 μm Lake Nojiri Shinano Nagano, 2004
P. viridis - Valve view - 140 x 25 μm Senjo-ga-hara Nikko Tochigi, 2003	P. viridis 138 x 23 μm Tashirodaira m. Hakkoda mountain Aomori, 2005	P. viridis - Valve view - 130 x 24 μm Hidaka Saitama, 2003	P. viridis 125 x 22 μm Iroha-numa Zao mountain Yamagata, 2005
P. viridis or P. maior ? 123 x 22 μm Koigakubo marsh Tessei-cho Okayama, 2004	P. viridis or P. maior ? 122 x 21 μm near Town Hall Shobu Saitama, 2005	P. viridis or P. semicruciata ? 99,120 x 21 μm Hakama marsh Madarao highland Niigata, 2005	P. viridis or P. maior ? 100 x 21 μm Demaru-nakago Kawajima Saitama, 2005
P. viridis 104-114 x μm Watarase Wetland Fujioka Tochigi, 2005	P. viridis μm Japan, 1997	P. viridis - Valve view - 109 x 24 μm Hidaka Saitama, 2003	P. viridis x 400 - Valve view - 106 x 19 μm Japan, 1998
P. viridis 104 x 21 μm Shimizu-daira Nasu Tochigi, 2005	P. viridis 103 x 25 μm Kisuge konuma Shimogo Fukushima, 2005	P. viridis 102 x 18 μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	P. viridis ? 101 x 19 μm Senjo-ga-hara Nikko Tochigi, 2003
P. viridis 90 x 18 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005	P. viridis μm Japan, 1997	P. viridis 89 x 18 μm Japan, 1998
P. viridis 88 x 19 μm Hitotsugi Yoshimi Saitama, 2004	P. viridis 82 x 17 μm Numa-no-hara m. Madarao highland Niigata, 2005	P. viridis ? or P. gibba ? 78 x 15 μm Shin-Akitsu Higashi-Murayama Tokyo, 2004	P. viridis ? 95 x 19 μm Ichinose-enchi Norikura highland Nagano, 2005
P. viridis ? 170 x 28 μm Shijuhachi-ike Shiga highland Nagano, 2005	P. viridis ? 46 x ? μm Japan, 1998	P. viridis ? - Valve view - 69 x 24 μm Uruguay, 1999

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