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 < 0.6		L/W 0.6-0.8	L/W > 0.8
v. dissiliens 26 samples 12-22 x 24-32 μm L/W=0.4-0.8 1999-2007	v. dissiliens 26 samples 12-22 x 24-32 μm L/W=0.4-0.8 1999-2007	v. dissiliens 9 samples 17-24 x 20-28 μm L/W=0.7-0.8 2003-2007	v. dissiliens 7 samples 19-23 x 21-23 μm L/W=0.8-1.0 2005-2007
H. dissiliens var. tatrica: 14-22 μm long, 14-20 μm wide
H. dissiliens v. tatrica 16 x 16 μm 14 x 15 μm L/W=0.9-1.0 Azami-ike Norikura highland Nagano, 2006	H. dissiliens v. tatrica x 15 μm L/W= Numappara Kuroiso Tochigi, 2003	H. dissiliens v. tatrica 15-20 x 16 μm L/W=0.9-1.3 Kodanuki marsh Fujinomiya Shizuoka, 2006	H. dissiliens v. tatrica 15 x 21 μm L/W=0.7 Shijuhachi-ike 2 Shiga highland Nagano, 2007
H. dissiliens v. tatrica 18 x 19 μm L/W=0.9 Tanohara m.1 Shiga highland Nagano, 2007	H. dissiliens v. tatrica 15 x 17 μm L/W=0.9 Numappara m. Nasu-shiobara Tochigi, 2007
H. dissiliens var. minor: 12-14 μm long, 15-20 μm wide
H. dissiliens v. minor 9-14 x 17 μm L/W=0.5-0.8 Kowashimizu Suwa Nagano, 2005	H. dissiliens v. minor 12-13 x 19-20 μm L/W=0.63-0.65 Kowashimizu Suwa Nagano, 2007	H. dissiliens v. minor 12.5 x 16 μm L/W=0.8 Numa-no-hara m. Madarao highland Niigata, 2006
H. indica: 15 μm long, 14 μm wide

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