We report a new chemotype of the crustose lichen Pertusaria paramerae A.Crespo & Vezda from a specimen collected in Turkey. Mitochondrial small subunit rDNA (mtSSU) sequences of P. paramerae collections from Spain, the country of the species' original description, and a specimen from Turkey are 100% identical. We present a phylogeny based on mtSSU rDNA that confirms the placement of Pertusaria paramerae in the Pertusaria s.str. group. HPLC analyses suggest the presence of 2'-O-methylperlatolic acid (major), thiophaninic acid (minor), and 2,4-dichloronorlichexanthone (trace) in the specimen collected in Turkey, and planaic acid (major), thiophaninic acid (minor), atranorin (trace), and an unidentified compound (trace) in a specimen collected in Spain. We propose that replacement of planaic acid by the structurally similar 2'-O-methylperlatolic acid and presence or absence of trace compounds are chemosyndromic variations that do not warrant recognition of a new species. We provide illustrations of morphological and micromorphological characters of P. paramerae.