Phylum: Charophyta   Family: Mesotaeniaceae

Netrium digitus (Brébisson ex Ralfs) Itzigsohn & Rothe 1856

A widespread species of acidic conditions, such as peat bogs and moorland pools. It is notably associated with Sphagnum where it is usually abundant.

References: 
Ohtani, S. (1990) A Taxonomic Revision of the Genus Netrium (Zygnematales, Chlorophyceae).
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland.
West, W. & West, G.S. (1904) A Monograph of the British Desmidiaceae, Volume 1.
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands.