Phylum: Chlorophyta   Family: Tribonemataceae

Tribonema viride A. Pascher 1925

First described and illustrated by Pascher (1925: 106, 87a). A mass-forming alga found in ditched and slow-running streams.
Cell dimensions: L. 15-55 µm; B. 6-15 µm.
Probably common in the Outer Hebrides.

References: 
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition). The Freshwater Algal Flora of the British Isles.
Pascher, A., Schiller, J. & Migula, W. (1925). Die Süsswasser-Flora Deutschlands, Österreichs und der Schweiz, Bd. 11: Heterokontae, Phaeophyta, Rhodophyta, Charophyta.