Genus: Cell body short cylindroid in shape, slightly constricted at the center; semicells trapezoid or rectangular in shape, lateral margins smooth or slightly convex; cells firmly attached with each other forming elongate filaments; colonies sometimes covered with thick gelatinous coats (Illustrations of The Japanese Fresh-water Algae, 1977).

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H. dissiliens var. dissiliens: 14-22 μm long, 23-32 μm wide
L/W less than 0.6
H. dissiliens v. dissiliens 12-14 x 28 μm L/W=0.4-0.5 Senjo-ga-hara Nikko Tochigi, 2003	H. dissiliens v. dissiliens 16-19 x 30-32 μm L/W=0.5-0.6 Kodanuki marsh Fujinomiya Shizuoka, 2005	H. dissiliens v. dissiliens 18 x 28 μm L/W=0.6 Kodanuki marsh Fujinomiya Shizuoka, 2006	H. dissiliens v. dissiliens 16 x 28 μm L/W=0.6 Lake Tanuki Fujinomiya Shizuoka, 2006
H. dissiliens v. dissiliens cell 17 x 32 μm L/W=0.5 Ikenokochi marsh Tsuruga Fukui, 2004	H. dissiliens v. dissiliens 16-21 x 32 μm L/W=0.5-0.7 Kitayama park Higashi-Murayama Tokyo, 2006	H. dissiliens v. dissiliens 17-22 x 32 μm L/W=0.5-0.7 Iyari marsh Omachi Nagano, 2006	H. dissiliens v. dissiliens 18-19 x 30 μm L/W= Iyari marsh 1 Omachi Nagano, 2007
H. dissiliens v. dissiliens 19 x 30 μm L/W=0.6 near Yamakado m Nishi-Azai Shiga, 2008	H. dissiliens v. dissiliens cell 16 x 29 μm L/W=0.6 Uruguay, 1999	H. dissiliens v. dissiliens 21 x 29 μm L/W=0.7 Koigakubo marsh Tessei-cho Okayama, 2004	H. dissiliens v. dissiliens μm Vermont-Maine USA, 1999
H. dissiliens v. dissiliens 18 x 28 μm L/W=0.6 Karakemi marsh Omachi Nagano, 2006	H. dissiliens v. dissiliens 18 x 32 μm L/W=0.56 Karakemi marsh Omachi Nagano, 2007
H. dissiliens v. dissiliens 15-16 x 27-29 μm L/W=0.6 Akai wetland Aizuwakamatsu Fukushima, 2005	H. dissiliens v. dissiliens 13-18 x 24-28 μm L/W=0.5-0.6 Kowashimizu Suwa Nagano, 2005	H. dissiliens v. dissiliens 18-19 x 28 μm L/W=0.64-0.68 Kowashimizu Suwa Nagano, 2007	H. dissiliens v. dissiliens 16 x 28 μm L/W=0.6 Biwanokage a.p. Tajima Fukushima, 2004
H. dissiliens v. dissiliens 17 x 28 μm L/W=0.6 Ichinose-enchi Norikura highland Nagano, 2005	H. dissiliens v. dissiliens 15-18 x 25 μm L/W=0.6-0.7 Ichinose-enchi Norikura highland Nagano, 2006	H. dissiliens v. dissiliens 19 x 25 μm L/W=0.8 near Oyomi marsh Hakuba Nagano, 2004	H. dissiliens v. dissiliens 16-20 x 24-25 μm L/W=0.7-0.8 Tashirodaira m. Hakkoda mountain Aomori, 2005
H. dissiliens v. dissiliens ? 16-17 x 25 μm L/W=0.6-0.7 Kejo-numa 1 Osaki Miyagi, 2006	H. dissiliens v. dissiliens 14 x 24 μm L/W=0.6 Muneoka Shiki Saitama, 2004	H. dissiliens v. dissiliens 13 x 25 μm L/W=0.5 Obihiro-Hasshonochi Obihiro Hokkaido, 2005
L/W 0.6-0.8
H. dissiliens v. dissiliens ? 17-21 x 20-22 μm Hachiman-numa m.2 Hachimantai Iwate, 2006	H. dissiliens v. dissiliens 17 x 23 μm L/W=0.7 Iroha-numa Zao mountain Yamagata, 2005	H. dissiliens v. dissiliens 19 x 23 μm L/W=0.8 Komado marsh Showa and Tajima Fukushima, 2004	H. dissiliens v. dissiliens 18-24 x 25 μm L/W=0.7-1.0 Komado marsh Showa and Tajima Fukushima, 2007
H. dissiliens v. dissiliens 15-17 x 24 μm L/W=0.6-0.7 Kakuman-buchi Akagi mountain Gunma, 2005	H. dissiliens v. dissiliens 15 x 22 μm L/W=0.7 Numappara Kuroiso Tochigi, 2003	H. dissiliens v. dissiliens 22 x 27 μm L/W=0.8 Numappara Kuroiso Tochigi, 2007	H. dissiliens v. dissiliens 17-18 x 23 μm L/W=0.7-0.8 Midori-no-ike Togakushi highland Nagano, 2005
H. dissiliens v. dissiliens 15 x 21 μm L/W=0.7 Fujimitashiro Oze-ga-hara Gunma, 2007	H. dissiliens v. dissiliens 21-22 x 28 μm L/W=0.7-0.8 Kashibaru m.1 Karatsu Saga, 2006
L/W more than 0.8
H. dissiliens v. dissiliens ? 21 x 22 μm L/W=1.0 Hachiman-numa m. Hachimantai Iwate, 2005	H. dissiliens v. dissiliens 20 x 23 μm L/W=0.9 near Iroha-numa Zao mountain Yamagata, 2006	H. dissiliens v. dissiliens 20 x 23 μm L/W=0.9 Iroha-numa 3 Zao mountain Yamagata, 2006	H. dissiliens v. dissiliens 19-23 x 23 μm L/W=0.8-1.0 East of Tojuro Azuma mountain Yamagata, 2007
H. dissiliens v. dissiliens ? 18-20 x 21 μm L/W= Shijuhachi-ike 2 Shiga highland Nagano, 2006	H. dissiliens v. dissiliens ? 16-21 x 21 μm L/W=0.8-1.0 Karakemi marsh Omachi Nagano, 2006	H. dissiliens v. dissiliens ? 23 x 23 μm L/W=1.0 Sukawa highland Kurikoma mt. Akita, 2007

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