Cryptodiscus muriformis and Schizoxylon gilenstamii, two new species of Stictidaceae (Ascomycota)

Cryptodicus muriformis and Schizoxylon gilenstamii (Stictidaceae, Ostropales, Lecanoromycetes, Ascomycota) are described as new to science from collections made in Europe (Sweden, Austria, Switzerland) and North America (Arizona), based on phylogenetic analyses of three loci. Both species show unique morphological characters that distinguish them from closely related species; Cryptodiscus muriformis, growing on decorticated or sometimes corticated branches of Picea abies and Pseudotsuga menziesii, that resembles C. foveolaris and C. tabularum in the yellowish-orange ascomatal disc, but is clearly distinguished by the muriform ascospores. Schizoxylon gilenstamii grows on dead stems of Globularia vulgaris and has a characteristic unique red-purple pigment in the epithecium and upper part of the excipulum that changes to bluish-green with KOH. We also report for the first time the anamorph of Stictis brunnescens.