Phylum: Charophyta   Family: Desmidiaceae

Micrasterias conferta Lundell 1871

West & West (1905, p. 88, pl. 43: 4-8) comment that it's one of the rarest British species, found largely in the north-west of Scotland, also western Ireland. An acidophile found in moorland peaty pools. One of the main distinguishing features is the broad polar lobe.

References: 
West, W. & West, G.S. (1905) A Monograph of the British Desmidiaceae, Volume 2.
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland.
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition) The Freshwater Algal Flora of the British Isles.