Montanelia tominii

Montanelia tominii, the dimpled camouflage lichen, is a species of foliose lichen in the family Parmeliaceae. The lichen forms variable, leaf-like thalli that range from thin and closely pressed to thicker and cushion-like, typically olive-brown to reddish-brown on the upper surface, with a dark brown to black underside. It is characterized by whitish pit-like or slit-like markings on the upper surface, sometimes forming faint patterns, and by powdery reproductive granules that can become coarse and clumped. The species occurs across the circumpolar Northern Hemisphere, growing on non-calcareous rocks in arctic and subarctic regions and at high elevations farther south. It has also been reported from Armenia. It was described under several different names over the 20th century before being recognized as a single widespread species....read more on Wikipedia.