Characteristics of variables included in regression models explaining richness, occurrence and abundance of red-listed lichens on 52 ancient oaks.

aIncluded in the model for Chaenotheca phaeocephala occurrence.bIncluded in the model for species richness, and in the models for Cliostomum corrugatum, Buellia violaceofusca and Calicium adspersum occurrences.cIncluded in the model for Ramalina baltica occurrence.