Prof. David Pegler is the only person to have published a short descriptive key to all accepted species in Inonotus P. Karst. (Pegler 1964). Since then, several new species have been added to the genus and our knowledge of the distribution of many species has been vastly expanded. Whilst preparing new polypore floras of tropical Africa and tropical America the need for an updated key to the genus became evident. This has now been accomplished and will form part of a forthcoming monograph of the genus (Gilbertson & Ryvarden 1999, in prep.). In the course of this work three African collections were examined which could not be assigned to any of the 70 species currently accepted in the genus, and they are herewith described as new.