Abstract

Postia alni Niemelä & Vampola, spec. nova (Basidiomycetes, Aphyllophorales), is a narrow-spored relative of Postia caesia (Schrad. : Fr.) P. Karst., growing on broad-leaved trees, e.g., alder and aspen. Skeletocutis friata Niemelä & Saarenoksa, nom. novum, will replace S. friabilis Niemelä & Saarenoksa, a homonym of S. friabilis (Corner) Quanten. The following combinations are proposed: Fibroporia norrlandica (Berglund & Ryvarden) Niemelä, comb. nova (Oligoporus norrlandicus Berglund & Ryvarden); Junghuhnia lacera (P. Karst.) Niemelä & Kinnunen, comb. nova (J. separabilima (Pouzar) Ryvarden). The following polypores are reported as new to Finland: F. norrlandica (also reported from France), Sistotrema dennisii Malençon, Skeletocutis ochroalba Niemelä, and Postia mappa (Overh. & Lowe) M.J. Larsen & Lombard. Skeletocutis krawtzewii (Pilát) Kotl. & Pouzar is reported from eastern Leningrad Region, Russia: this is the second find of the species after its description from Siberia. Junghuhnia fimbriatella (Peck) Ryvarden was found in Leningrad Region; this is the first record in northern Europe. Skeletocutis borealis Niemelä and many other rare species are discussed, including new localities from Finland and/or NW Russia. Some of them are illustrated, and many species are supplied with detailed spore measurements. 143 polypore species were recorded and collected by the authors and their co-workers in virgin forests of Russian Karelia in wide sense; 12 of them are new to the area.

Key words: Aphyllophorales, Basidiomycetes, Finland, fungi, Karelia, old-growth forest, polypores, Russia