Lišejníky zaznamenané během bryologicko-lichenologických dní na Kokořínsku

This contribution provides records on 160 lichenised fungi observed during several excursions to the Kokořín area in northern Bohemia. The landscape is dominated by extensive sandstone rock complexes and pine forests, which are generally poor in lichen diversity, but quite rich in the occurrence of some specialised and rare species. Some communities, such as heathlands, rock outcrops and relict pine forests on rocks, are nevertheless dominated by lichens, mostly by various Cladonia species. For example, local populations of Cladonia portentosa belong to the richest in the country. Besides sandstones, we briefly explored also some volcanic rocks. Porpidia cf. pachythallina is published as new to the Czech Republic. Sequenced specimens of Porpidia sp. and Schaereria sp. from acidic sandstones may represent undescribed species. Acarospora versicolor, Aspiciliella intermutans agg., Cladonia strepsilis, Endocarpon adscendens, Fuscidea austera, F. praeruptorum, Hypotrachyna revoluta, Pertusaria amarescens, P. ocellata, Stereocaulon condensatum, and Trapelia involuta s. str. are other valuable records.