Fairy Glen woods is a semi-natural broadleaved woodland set on a deep rocky gorge on the Afon Conwy near Betws y Coed. Trees include sessile oak and ash together with some small leaved lime, birch and wych elm. The humid conditions in the gorge provide ideal conditions for mosses, lichens, liverworts and ferns.
Here’s the Countryside Council for Wales / Natural Resources Wales’ information about the Fairy Glen woods, a site of Special Scientific Interest, through which the hydro scheme’s pipeline will be laid. Some useful resources here too on the species to be found in and around the woods.