Phylum: Chlorophyta   Family: Trentepohliaceae

Trentepohlia abietina  (Flotow ex Kützing) Hansgirg

A terrestrial species usually found on bark of trees but occasionally on other substrates where sufficient moisture is found

References: 
John, D.M., Whitton, B.A. & Brook, A.J. (2011) - The Freshwater Algal Flora of the British Isles