Thelotrema lepadinum 'Bark Barnacles'. Thanks to John Davis for the probable ID. Gray crustose lichen with a thin, continuous to rimose cracked thallus with abundant apothecia resembling small volcanoes or barnacles with cavities where the disk would normally be. Growing on the mossy bark of a Hemlock tree, Cowichan Provincial Park, Duncan, Vancouver Island, 5876September_14__2010