Phylum: Chlorophyta   Family: Chlamydomonadaceae

Chlamydomonas mutabilis J. Gerloff 1940

First described and illustrated by Gerloff (1940: 396, 459, figs 41-42). The single pyrenoid in this species is almost central.
Cell dimensions: L: 17-25 µm; B: 8-15 µm.
Found in acidic conditions such as moorland pools and abandoned peat-cuttings. Status in the Outer Hebrides is unclear, probably under-recorded.

References: 
Gerloff, J.(1940). Beiträge zur Kenntnis der Variabilität und Systematik der Gattung Chlamydomonas.
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition). The Freshwater Algal Flora of the British Isles.