Botanical Name: Evernia prunastri. Other Common Names: Ekmossa (Swedish), mousse de chêne (French), Eichenmoss (German). Habitat: Oakmoss is widespread throughout Europe, North Africa, Asia and North America. Description: Evernia prunastri or oakmoss is a lichen of the Parmeliaceae family. The genus Evernia contains about ten different species. The thalli (the vegetative body of a lichen) are bush-shaped and grow together to form large clumps. The thallus is flat and highly branched. It grows on trunks and branches of shrubs and deciduous trees like oaks, fruit trees, and blackthorn but also sometimes on pine trees. It is green to light whitish-green