In an analysis of the history of the names Polyporus frondosus (Dicks.) per Fr. and P. intybaceus Fr. the author delves back as far as 1552; he concludes that the two taxa were introduced for a single species. — The genus Oligoporus Bref. is restored and its type species ( O. farinosus Bref.) identified with both Polyporus rennyi B. & Br. and Ptychogaster citrinus Boud. — One new specific combination is made in each of the following genera: Oligoporus Bref., and Pycnoporellus Murrill. — 15 specific names are discussed for different reasons.