Lichens of the family Teloschistaceae in Dagestan, an eastern part of the Caucasian biodiversity hot-spot
Vondrák, Jan; Ismailov, Aziz; Urbanavichus, Gennadii
Teloschistaceae, one of the largest families of lichenized fungi, has its known Eurasian diversity hot-spots in the Mediterranean basin and in arid continental territories. The Caucasus is a natural boundary between these territories and the diversity of Teloschistaceae is therefore expected to be high in this region. We studied the easternmost part of the Caucasus, Dagestan, a region neglected by lichenologists in the past, but with recent lichenological activity. We provide here a checklist of 85 species of Teloschistaceae, 39 of them new to Dagestan from our field work in 2015, and four species new to Russia (Athallia nesodes, "Caloplaca" emilii, "Caloplaca" xerica and Gyalolechia epiphyta). This total is higher than the numbers known from some well-surveyed Central European countries, but lower than numbers reported from Mediterranean countries. It suggests a rather high diversity of Teloschistaceae in Dagestan, although the absence of well-developed maritime and Mediterranean habitats (which are usually rich in species of Teloschistaceae) precludes an even higher diversity.