Clades:
Polyporales.
Genera: 47 genera; 645 species; Merulius as the type genus.
Genera: Aegerita, Aegeritopsis, Amaurohydnum, Amauromyces, Aquascypha, Atheliachaete, Aurantiopileus, Aurantiporus, Bulbillomyces, Ceriporiopsis, Cerocorticium, Chrysoderma, Climacodon, Columnodontia, Conohypha, Coralloderma, Crustoderma, Crustodontia, Cyanodontia, Diacanthodes, Elaphroporia, Gloeoporus, Gyrophanopsis, Hydnophanerochaete, Hydnophlebia, Hyphoderma, Hyphodontiastra, Hypochnicium, Irpex, Lilaceophlebia, Luteoporia, Mycoacia, Mycoaciella, Mycoleptodonoides, Niemelaea, Phlebia, Phlebiporia, Sarcodontia, Scopuloides, Spathulina, Stegiacantha, Stereopsis, Uncobasidium.
Ecology: cause of white rot.
MycologyType: crust-like or polyporoid; waxy appearance when dry.
Hyphens: hyphal systems are monomitic, containing only tightly arranged generative hyphae; these hyphae have clamp connections.
Hymenium: cystidia are often present in the hymenium.
Spores: smooth; thin-walled; hyaline, translucent.