Type studies of Polyporaceae (Aphyllophorales) described by J. Rick

The type species of Polyporaceae (Aphyllophorales) and of other related genera, i.e. Irpex, Grammothele and Theleporus , described by J. Rick were studied. Of the 93 names of species or varieties 34 are invalidly published and 21 are synonyms. Nineteen type specimens were not found and 4 were sterile. Four species were respectively assigned to Datronia, Steccherinum, Trechispora and a cyphellaceous fungus, and were left without specific determination. The following new combinations are proposed: Aporpium substuppeus, Ceriporiopsis latemarginata, Inonotus micantissimus, Junghuhnia polycystidifera, Perenniporia piperis, Phanerochaete furfuraceo‐velutinus, Skeletocutis roseolus and Tyromyces atro‐albus. Two new species are described: Ceriporiopsis lowei and Gloeodontia americana.