Genus: Cellwall shows H shape in transverse section; chloroplasts reticulatedwithout pyrenoids.
Species: Cell body 6.6-13 μm in diam., length 1.3-3 times longer than witdh; H structure conspicuous, cell wall 1.5-2.5 μm in thickness

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Microspora sp. ? 23-28 x 11 μm Obihiro-Hasshonochi Obihiro Hokkaido, 2005	M. pachyderma ? 14-20 x 11.5 μm Sukawa highland Kurikoma mountain Akita, 2005	M. pachyderma ? μm Ryugahara m.2 Yuri-Honjo Akita, 2008
M. pachyderma ? 15-20 x 13 μm Yukawa-numa Nishiwaga Iwate, 2007	M. pachyderma ? 12-15 x 9-11 μm Jodo-daira Azuma mountain Fukushima, 2006
M. pachyderma ? 8-18 x 11-14 μm Nakatashiro Oze-ga-hara Gunma, 2006	M. pachyderma ? x 13-14 μm Yokotashiro 2 Katashina Gunma, 2007	M. pachyderma ? 16-19 x 11 μm 7-13 x 9 μm Senjo-ga-hara Nikko Tochigi, 2006	M. pachyderma ? 10-18 x 11 μm Uzuma-koen Tochigi city Tochigi, 2006
M. pachyderma ? 10-14 x 9-10 μm Hakama marsh Madarao highland Niigata, 2005	M. pachyderma ? 22-24 x 13 μm 13-27 x 20 μm Midagahara Tate-yama Toyama, 2006	M. pachyderma ? x 12-14 μm Ushidome-ike Norikura highland Nagano, 2007
M. pachyderma ? 10-22 x 12 μm Karakemi marsh Omachi Nagano, Apr. 2005	M. pachyderma ? 11-22 x 12 μm Karakemi marsh Omachi Nagano, Nov. 2005	M. pachyderma ? 12-13 x 12 μm Karakemi marsh Omachi Nagano, 2006	M. pachyderma ? μm Karakemi m.2 Omachi Nagano, 2008
M. pachyderma ? 9-12 x 12 μm Iyari marsh Omachi Nagano, 2005

Similar genera -->> Tribonema; Geminella; Cylindrocapsa;

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