Cladonia diversa (Cladoniaceae, Lichenized Ascomycota) - overlooked lichen in Poland

This is the first report on Cladonia diversa Asperges in Poland. Till the present this species was overlooked and usually included under the name C. coccifera . The study is based on revision of over a thousand of specimens of the genus Cladonia section Cocciferae deposited in Polish herbaria. The morphology, chemistry, habitat requirements and known distribution of the lichen in Poland are discussed. A taxonomical remarks concerning the species are also provided.