Rostania revised: testing generic delimitations in Collemataceae (Peltigerales, Lecanoromycetes)

Here, we test the current generic delimitation of (Collemataceae, Peltigerales, Ascomycota) utilizing molecular phylogeny and morphological investigations. Using DNA sequence data from the mitochondrial SSU rDNA and two nuclear protein-coding genes (MCM7 and β-tubulin) and utilizing parsimony, maximum likelihood and Bayesian phylogenetic methods, is shown to be non-monophyletic in the current sense. A new generic delimitation of is thus proposed, in which the genus is monophyletic, and three species ( , , ) are excluded and transferred to other genera. is further non-monophyletic, and a more detailed investigation of species delimitations in s. str. is needed. The new combinations and are proposed.