Lecanora somervellii – new lichen for Russia from Magadan Region

The description and locality of the new to North Asia and Russia lichen species Lecanora somervellii Paulson found in Magadan Region are reported. The species is characterized by its effigurate, citrine-yellow thallus (due to the production of calycin and usnic acid), and convex apothecia with soon disappearing thalline margin and 8-spored asci. The species was previously known from Himalaya Mountains and Tibet.