Genus: Cell body elongate, cylindrical or spindle-shaped, apex dorso-ventrally compressed with a deep incision; centrally constricted to form 2 semicells; cell wall dotted or covered with small pores; chloroplasts consisting of axis and lateral laminae, pyrenoids arranging linearly along the axis; zygotes spherical, smooth or rectangular with rounded corners (Illustrations of The Japanese Fresh-water Algae, 1977).
Species[v. brebissonii]: Cell body 100-264 μm long, 19-39 μm wide;
[v. minor]: Cell body 57-100 μm long, 19-39 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. brebissonii: Cell body longer than 100 μm
T. brebissonii v. brebissonii 130 x 27 μm Numa-no-hara marsh Madarao highland Niigata, 2005	T. brebissonii v. brebissonii 130 x 23 μm Ohnuma Nasu-shiobara Tochigi, 2006	T. brebissonii v. brebissonii 104 x 28 μm Yamamuro m.1 Maibara Shiga, 2008
T. brebissonii v. brebissonii 166 x 27.5 μm Kashibaru marsh 6 Karatsu Saga, 2006	T. brebissonii v. brebissonii 140 x 25 μm Kashibaru m.2 Karatsu Saga, 2008
var. minor: Cell body shorter than 100 μm
T. brebissonii v. minor 75 x 21 μm Sukawa highland Kurikoma mt. Akita, 2007	T. brebissonii v. minor 64-69 x 21 μm Midagahara Tate-yama Toyama, 2006
T. brebissonii v. minor 78 x 20 μm Ukishima marsh Tsugaike highland Nagano, 2006	T. brebissonii v. minor 95 x 23 μm 82 x 19 μm Kamino-tanbo Tsugaike highland Nagano, 2006	T. brebissonii v. minor 92 x 22 μm 74 x 18 μm Tanohara marsh Shiga highland Nagano, 2006	T. brebissonii v. minor 90 x 23 μm Tanohara marsh Shiga highland Nagano, 2004
T. brebissonii v. minor 68-70 x 17-19 μm Tanohara marsh Shiga highland Nagano, 2005	T. brebissonii v. minor 66 x 19 μm Hikage marsh Shiga highland Nagano, 2005	T. brebissonii v. minor 63 x 18 μm Hikage marsh Shiga highland Nagano, 2006
T. brebissonii v. minor 78 x 20 μm Imou bog 3 Toyohashi Aichi, 2006

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