Phylum: Charophyta   Family: Desmidiaceae

Micrasterias conferta P.M. Lundell 1871

First described and illustrated by Lundell (1871: 14, pl. 1: 5). West & West (1905: 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. One of the main distinguishing features is the broad polar lobe.
Cell dimensions: L: 80-100 µm; B: 75-90 µm; Is: 16-19 µm; L/B: 1.00-1.15.
An acidophile found in moorland peaty pools.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition) Desmids of the Lowlands.
Lundell, P.M. (1871) De Desmidiaceis, quae in Suecia inventae sunt, observationes criticae.
West, W. & West, G.S. (1905) A Monograph of the British Desmidiaceae, Volume 2.