Lecanora crassithallina (Lecanoraceae), a new lichen from northern Mexico

Abstract The new lichen species Lecanora crassithallina, characterized by a thick, areolate thallus and abundant macropycnidia with short, bacilliform macroconidia, is described from northern Mexico. The new species belongs to the Lecanora saligna group and is most related to L. albellula, L. coniferarum and L saligna.