Usnea balcanica Bystr. – a new Usnea species in Poland (Ascomycota, Parmeliaceae)

Usnea balcanica Bystr., a new species in Poland, was collected in the Roztocze National Park in 1962. It grew on a branch of an old beech, in a light beech forest, in the Obrocz reserve. This very rare species is known so far only from the mountain forests of the Balkan Peninsula (11)