Phylum: Cyanobacteria   Family: Stigonemataceae

Stigonema mamillosum C. Agardh ex É. Bornet & . Flahault, 1887

First described by Agardh in Bornet & C. Flahault (1887: 77) as Sirosiphon mamillosum. A relatively common species found on rocks in flowing waters but also with seepages in rocks.

References: 
Bornet, É. & Flahault, C. ('1886' 1887). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France.
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition). The Freshwater Algal Flora of the British Isles.