Phylum: Charophyta Family: Desmidiaceae
Cosmarium repandum var. papillatum D.B. Williamson
First described in 1997 from a slightly acidic roadside pool near Forsinard, north Sutherland. This current find is thought to be the second example. Similar to the equally rare C. lapponicum but with noticeably more convex apices
References:
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland