Stereophlebia in North America

The new species Stereophlebia arizonica from southern Arizona is described and illustrated. Although similar to S. pendula, a widely distributed taxon in North America, molecular phylogenetic analyses and morphological evidence show that they are distinct, sister species. Phylogenetic analyses place Stereophlebia in a clade with Gelatinofungus within the Phanerochaetaceae (Polyporales). Critical morphological features of Gelatinofungus not reported earlier are presented, and G. betulinus is determined to be a later synonym of S. pendula.