The delimitation between Inonotus nodulosus (Fr.) P. Karst. and I. polymorphus sensu Bourd. et L. Maire is discussed and the latter species is described as a new one — I. hastifer Pouz. — the original Polyporus polymorphus Rostk. being identical with I. nodulosus. On Fagus sylvatica in Central Europe in mountains a species of Inonotus is widely distributed called Inonotus polymorphus (Rostk.) Pil. sensu Bourdot et L. Maire. This species has been well characterized e.g. by Jahn (1965), Domański (1963, 1965, 1972) and Pegler (1964). Nevertheless the name used for this species is quite untenable because the original description and illustration by Rostkovius (1838, tab. 56) represents a quite different fungus, viz. Inonotus nodulosus (Fr.) P. Karst. As I found no available name for this polypore I describe it here as new even if it has been well known for a half of a century and it is quite common locally. Nevertheless the nomenclatural Code (Stafleu et al. 1978) requires such a procedure.
Pouzar Z. (1981): Notes on the taxonomy and nomenclature of the polypore Inonotus polymorphus. – Česká Mykologie 35(1): 25–28.
