@misc{Bystrek_Jolanta_Usnea,
 author={Bystrek, Jolanta and Bystrek, Jan (1934- )},
 howpublished={online},
 publisher={Wydaw. UMCS},
 language={eng ; pol},
 type={artykuł},
 title={Usnea balcanica Bystr. – a new Usnea species in Poland (Ascomycota, Parmeliaceae)},
 keywords={Usnea balcanica, porosty, Roztoczański Park Narodowy},
}