Montanelia saximontana

Montanelia saximontana is a species of foliose lichen in the family Parmeliaceae. It is characterized by its olive-brown, leafy growth form with powdery reproductive structures (soredia) and a black underside. The species grows on rocks and occasionally on tree bark across western North America, from British Columbia south to Arizona. Originally described from specimens collected in Colorado in 1962, it was transferred to its current genus in 2016 based on DNA evidence. It is closely related to the Asian species Montanelia tominii and can only be reliably distinguished from it using DNA sequences. Thalli can grow up to 15 cm (6 in) across, typically forming rosettes on rock surfaces....read more on Wikipedia.