Tree lungwort (Lobaria pulmonaria) growing on Hazel (Corylus avellana) Lungwort is an indicator of air pollution as it only grows in clean air. Sutherland, Scotland

tree lungwort lungwort lobaria pulmonaria corylus avellana hazel the mound and alderwoods national nature reserve mound and alderwoods nnr sutherland scotland scottish britain british uk united kingdom air pollution close up close up vertical plants lichens lichen s072