A rare liverwort in the Mediterranean area, Crossocalyx hellerianus (Nees ex Lindenb.) Meyl., newly recorded for Montenegro

A new species for Montenegro, Crossocalyx hellerianus was recorded during a bryological field investigation of the Durmitor Mountains. To our knowledge this is the first record of the genus Crossocalyx for the bryophyte flora of Montenegro. We report the distribution of C. hellerianus in the Mediterranean region, and provide a short description of the ecology of the species and its Montenegrin population.