Phylum: Charophyta Family: Closteriaceae
Closterium calosporum var. brasiliense Børgesen 1890
Much commoner than the nominate variety, occupying similar habitats.
References:
Børgesen, F. (1891) Symbolae ad floram Brasiliae centralis cognoscendam.
West, W. & West, G.S. (1904) A Monograph of the British Desmidiaceae, Volume 1.
Ruzicka, J. (1977) Die Desmidiaceen Mitteleuropas, Volume 1, Part 1.
Brook, A.J. & Williamson, D.B. (2010) A Monograph on some British Desmids.
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands.