Abstract
Twenty-one species are treated in detail. New specific combinations are proposed as Ceraceomerulius albostramineus (Torrend) and its variety flavido-albus (Corner); as Ceraceomyces serpens (Ft.); as Gloeoporus chlorinus (Pat.) and G. subambiguus (P. Henn.); as Leucogyrophana luridochracea (Corner), L. sororia (Burt) and L. montana (Burt); as Meruliopsis ambiguus (Berk.), M. bellus (Berk. & Curtis), M. corium (Fr.), M. hirtellus (Burt), and M. miniatus (Wakef.); and as Radulomyces fuscus (Lloyd). Cultural characters are described in detail for the first time for M. ambiguus, M. hirtellus, Merulius incarnatus Schw., C. borealis (Rom.), C. serpens, and Ceraceomerulius albostramineus. Extensive new synonymy is proposed, which is based on the study of nearly 150 type specimens, and a nomenclator is included which contains over 350 valid combinations in Merulius.