Brodoa oroarctica

Brodoa oroarctica, commonly known as the Arctic sausage lichen, mountain sausage lichen, or rockgrub, is a species of rock-dwelling, foliose lichen in the family Parmeliaceae. First described in 1974 by the Norwegian botanist Hildur Krog, it is characterised by its dark grey, irregularly spreading thallus with narrow cylindrical lobes that grow loosely attached to rock surfaces. The species has a primarily circumpolar distribution across Arctic regions of the Northern Hemisphere, extending southward along the Rocky Mountains in North America, with notable disjunct populations in the White Mountains of New Hampshire, the Adirondack Mountains of New York, and the island of Newfoundland. It is distinguished from related species by its chemical composition, containing atranorin and physodic acid, and its preference for exposed Arctic–alpine habitats with limited snow cover. While common in its main Arctic range, its isolated southern populations are of conservation interest due to their ra......read more on Wikipedia.