Abstract
Abstract The biology of calcicolous endolithic lichens is far from being well-known. In this paper the results of a multidisciplinar research are presented. The study is based on laboratory and field data, and is divided in four parts: (1) anatomical investigation of the species; (2) characterization of gas exchange rates of selected epi- and endolithic lichens; response curves were obtained in dependence to the main abiotic factors (thallus water content, light, CO2 concentration, temperature); (3) characterization of chemical-physical parameters of the substratum (porosity, capillarity, etc.); (4) field measurements of microclimatic parameters in the habitat of each species, and quantification of thallus hydration in situ during selected days at different weather conditions. Six species, five of them endolithic (Acrocordia conoidea, Petractis clausa, Rinodina immersa, Verrucaria marmorea and Verrucaria sp.) and one epilithic (Aspicilia radiosa) were investigated in the VG 46 abyss near Gropada (Trieste ...
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