Abstract
During 2013 and 2014 the lichen diversity of the protected area Medník was explored. The locality is dominated by natural deciduous forests like scree, beech and oak-hornbeam forests.
Small volcanic rocky outcrops and shady boulder screes are present as well. The lichen flora consists of 111 recorded species, with saxicolous and epiphytic species predominating.
Although the character of the area (the low age of forests, only small rocky outcrops, air pollution in the past) predicts more or less low lichen diversity, several rare species were recorded. The rare or overlooked lichens from the Medník locality are Arthonia atra, A. didyma, Bacidia trachona, Bacidina caligans, Endocarpon psorodeum, Pertusaria aspergilla, Pyrenula nitidella, Verrucaria fusca, and V. memnonia.