Phylum: Chlorophyta Family: Chlorellaceaea
Geminella mutabilis (Brébisson) Wille
Found in Sphagnum bogs, moorland pools and disused peat-cuttings. Distribution unclear but possibly not uncommon in suitable habitats
References:
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition) The Freshwater Algal Flora of the British Isles