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Guttova, A., Valachovic, M., Tzonev, R., Ganeva, A., Shivarov, V. V. & Fackovcova, Z. 2020. Lichens recorded in chasmophytic communities associated with relict and endemic plant species in Bulgaria. – Herzogia 33: 407– 419.The mid-altitudes of Bulgaria comprise a wide range of sparsely vegetated ecosystems, including rock cliffs and outcrops. They host chasmophytic communities supporting different range-restricted or rare plants. Sampling vegetation releves, we recorded the present lichen biota. Here we report on the occurrence of 143 lichen species. Out of them, we shortly comment on noteworthy species, specifically those which have not been reported from Bulgaria so far – Acarospora moenium, A. oligospora, Agonimia globulifera, A. opuntiella, Anema tumidulum, Fuscopannaria mediterranea, Lempholemma chalazanum, Leptogium brebissonii agg., Lichinella cribellifera, Psora vallesiaca, Pyrenopsis grumulifera, Scytinium aragonii, S. schraderi, Thelopsis lojkana, and Thalloidima tauricum.

Temperature preferences and small-scale distribution patterns of fourDermatocarpontaxa in the catchment areas of two Bulgarian rivers were analyzed. Taxa with an overall alpine or arctic-alpine distribution were restricted to microhabitats with the lowest water and rock surface temperatures. A trend for increasingDermatocarpon rivulorumthallus diameter and colony size (aggregates of thalli) with decreasing temperature was identified. Data on pH and conductivity of the water for the study sites are provided for all taxa.Dermatocarpon arnoldianumis reported for the first time from Bulgaria, confirmed by ITS sequence data, and its known range extends to South-East Europe. All previous records ofD. rivulorumfrom Bulgaria were based on misidentified specimens ofD. arnoldianum. Freshwater taxa ofDermatocarponare proposed as a tool for monitoring the biological effects of temperature changes due to global climate change. Thallus and colony size are recommended as additional features for monitoring populations of threatenedDermatocarponspecies.

Five lichenized fungi in Verrucariaceae, Hydropunctaria rheitrophila, Th elidium fontigenum, T. zwackhii, Verrucaria aquatilis, and V. elaeina, are reported for the fi rst time from Bulgaria. Detailed descriptions, illustrations, and comments are provided.