stone and dark fungus

alga america american americana and appalachain appalachia appalachian background black blue boulder boulders close closeup covering covers cracks dark details drive driving ecology flora fungus gray green growing lichen lichens located moss mossy mountain mountains mountian mountians national natural nature old organism organisms park parkway pkwy plant plants reindeer relationship ridge rock rocks rocky shenandoah skyline states stone stonewall symbiotic texture textured textures thorn united usa virginia wall