Parmelia Sulcata (Hammered Shield) is a blue-grey leaf-like lichen that inhabits urban, rural and remote environments alike. Found mostly on wood throughout Alberta, this adaptable species deals with stress by producing chemicals that act as sunscreen to regulate harmful rays or deterrents to insects looking for a snack. Often mistaken for Hooded Tube, Hammered Shield produces abundant black, bottle-brush-like structures on its lower surface. Named for the depressions that resemble hammered metal, if you only learn one Alberta lichen this is a good choice – you will be able to impress your friends with your botanical knowledge no matter where you travel.