Lišejníky, mechorosty a cévnaté rostliny zámeckého parku Osečany u Sedlčan

The Osečany castle park (c. 7 ha; alt. 310–350 m) is situated on steep, locally rocky slopes above the Mastník stream. It is dominated by a (semi-)naturally occurring, predominantly deciduous forest with a rich species composition. The oldest trees are between 150 and 200 years old. During a survey in 2023, a total of 79 lichen species, six lichenicolous or lichen-like fungi, 80 bryophytes, and 146 vascular plants were recorded in the park. Within the Sedlčany region, the area belongs to the most valuable localities for epiphytic lichens. The most important lichen records are Acrocordia gemmata, Arthonia dispersa, A. didyma, A. helvola, Arthopyrenia salicis, Chaenotheca brachypoda, Endocarpon adscendens, Eopyrenula leucoplaca, Lecania croatica, Opegrapha vermicellifera, Phaeophyscia chloantha, Porina byssophila, and Pyrenula nitida. The moss Hygroamblystegium fluviatile and the vascular plant Dipsacus strigosus are reported from the Sedlčany region for the first time. Corydalis intermedia represents the most valuable wild plant species in the park. Identifications of Endocarpon adscendens and Lecania croatica are supported by molecular ITS and mtSSU data.