Family: Unicells or cells loosely attached forming hyphae; cell body varied in shape, a constriction at the center in most species; cell walls consisting of two or more parts, with small pores and various ornaments (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus:

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B. brebissonii 23-30 x 18 μm Kenashitai Hakkoda mountain Aomori, 2005	B. brebissonii 28-30 x 18-20 μm Shimo-Kenashitai 1 Hakkoda mountain Aomori, 2006	B. brebissonii 24-27 x 18 μm Mida-ga-hara Gassan Yamagata, 2005	B. brebissonii 28-31 x 18-19 μm Yahei-daira m8 Azuma mt. Yamagata, 2007
B. brebissonii 25 x 21 μm Sukawa highland Kurikoma mountain Akita, 2005	B. brebissonii 25 x 18 μm Sukawa highland Kurikoma mountain Iwate, 2007	B. brebissonii x μm Mitsuishi marsh Hachimantai Iwate, 2008	B. brebissonii 27 x 17 μm Midagahara Tate-yama Toyama, 2006
B. brebissonii 26 x 21 μm Oze-ga-hara Katashina Gunma, 2006	B. brebissonii 23-27 x 19 μm near Akagi mt. Fujimi Gunma, 2005	B. brebissonii x μm Kareki-numa Nikko Tochigi, 2008
B. brebissonii 20-28 x 18-19 μm Shimo-no-koike Shiga highland Nagano, 2004	B. brebissonii stock Nsh-1, -2 Shimo-no-koike Shiga highland Nagano, 2004	B. brebissonii 25-30 x 20 μm Shimo-no-koike Shiga highland Nagano, 2005	B. brebissonii 29-31 x 17 μm Shimo-no-koike Shiga highland Nagano, 2006
B. brebissonii 18-27 x 22 μm Karakemi marsh Yasaka Nagano, 2005	B. brebissonii 27-30 x 17-20 μm Karakemi marsh Yasaka Nagano, 2006	B. brebissonii 26-28 x 18 μm Ukishima marsh Tsugaike highland Nagano, 2005	B. brebissonii 30 x 20 μm Hikage marsh Shiga highland Nagano, 2005
B. brebissonii 26 x 18 μm Watasuge marsh Tsugaike highland Nagano, 2006	B. brebissonii 26 x 19 μm Ukishima marsh Tsugaike highland Nagano, 2006
B. brebissonii 19 x 17 μm Koigakubo marsh Tessei-cho Okayama, 2004	B. brebissonii 24-26 x 18-20 μm Kodanuki marsh Fujinomiya Shizuoka, 2006	B. brebissonii 21-26 x 18-19 μm Kashibaru m.5 Karatsu Saga, 2006	B. brebissonii 18-22 x 20-21 μm Kashibaru m.5 Karatsu Saga, 2006

Similar genus -->> Hyalotheca;

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