Lepraria borealis

Lepraria borealis is a species of leprose lichen in the family Stereocaulaceae, found predominantly in cool climates across Northern Europe, northwestern North America, Greenland, and Antarctica. It primarily grows on acidic rock and moss-covered surfaces, occasionally occurring on soil or other lichens. The species forms a granular crust with abundant soredia and shows considerable chemical variation, typically containing atranorin and rangiformic acid....read more on Wikipedia.