Parmelia ernstiae

Parmelia ernstiae is a species of foliose lichen in the family Parmeliaceae. It is part of the Parmelia saxatilis species complex and can be distinguished from similar species by its strongly pruinose thallus, small rounded lobes, and unique secondary metabolite composition. First described in 2002 from Germany, P. ernstiae has since been found to be widely distributed across Europe, including Fennoscandia, Eastern Europe, and more recently, the Macaronesian region. The species typically grows on tree bark in various forest types, but has also been observed on rocks. Its identification often requires a combination of morphological, chemical, and molecular data due to its similarity to other Parmelia species....read more on Wikipedia.