Phylum: Charophyta Family: Closteriaceae
Closterium attenuatum Ralfs 1848
The main feature of this species is the narrowing of the cell to the apices, hence the epithet. Widely distributed in acidic conditions such as peaty pools and disused peat-cuttings.
References:
Ralfs, J. (1848) The British Desmidieae.
West, W. & West, G.S. (1904) A Monograph of the British Desmidiaceae, Volume 1.
Brook, A.J. & Williamson, D.B. (2010) A Monograph on some British Desmids.
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland.