Abstract
SSU nrDNA studies of two representatives of the lichenicolous genus Phacopsis revealed that they belong to the family Parmeliaceae (Lecanorales) and therefore represent lichenicolous lichens with an endokapylic thallus. Because they are the only lichenicolous taxa within this family, it is suggested that their transition from a foliose and/or fruticose precursor lichen might have been due to a unique (or rare) evolutionary one step event(s). Phylogenetic analyses of the ITS nrDNA of the type species of Phacopsis (P. vulpina) and Nesolechia (N. oxyspora = P. oxyspora) could neither confirm nor reject a monophyletic origin of these two Parmeliacean genera, as previously implied by their synonymization. However, it is considered premature to draw nomenclatorial consequences.
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