Phylum: Charophyta   Family: Desmidiaceae

Cosmarium porteanum W. Archer

This species was named for George Porte (1819-1892) and the spelling corrected accordingly from C. portianum under which name most records can be found. Fairly common in moorland pools and loch-margins

References: 
West, W. & West, G.S. (1908) A Monograph of the British Desmidiaceae, Volume 3
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands