Abstract
AbstractPhylogenetic reconstructions based on ITS/5.8S and mtSSU DNA sequence data suggest a close relationship between twoLecanoraspecies containing calycin and usnic acid and theLecanora polytropagroup.Lecanora solarisYakovchenko & Davydov sp. nov. is described from the Altai Mountains in Russia. Its gross morphology resembles that ofL. somervelliias both species have an effigurate, citrine-yellow thallus (due to the production of calycin). However,L. solarisis distinguished fromL. somervelliiby having a small, squamulose to marginally lobate umbilicate thallus and apothecia with a persistent margin, whereasL. somervelliihas a large, distinctly placodioid thallus and an apothecial margin that is soon excluded.
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