Changbai wood-rotting fungi 9. Three new species and other species in Rigidoporus, Skeletocutis and Wolfiporia (Basidiomycota, Aphyllophorales)

Three new polypore species, Rigidoporus eminens Y. C. Dal, Skeletocutis subvulgaris Y. C. Dal, and Wolfiporia cuvispoa Y. C. Dal, are described and illustrated based on recent collections from Northeast China. Rigidoporus eminens is closely related to R. undatus (Pers.: Fr.) Donk, but differs by its soft corky to fragile basidiocarps, lacerate tube dissepiments, thin-walled tramal hyphae, and thicker cystidia, strongly penetrating the hymenium. Skeletocutis subvulgaris is similar to S. vulgaris (Fr.) Niemela & Y. C Dai in its ecology, morphology and shape of basidiospores, but it has no stellate crystal clusters on the hyphae, and its generative hyphae are covered with fine, sharp-pointed encrustations (the typical characters of Skeletocutis Rod. & Pouzar). Wolfiporia curvispora is distinguished from the other species of the genus by its biennial habit, small pores, curved cylindric spores, and uninflated subicular hyphae. All the Chinese species in the genera of Leucophellinus Singer, Oxyporus Donk, Rigidoporus Murrill, Physisporinus P. Karst., Skeletocutis and Wolfiporia Ryvarden & Gilb. were studied, and keys for these species are given. Statistical variation of spore dimensions are included in the keys. The combination of Physisporinus xylostromatoides (Berk.) Y. C. Dai is proposed. Oxyporus bucholtzii (Bondartsev & Ljub.) Y. C. Dai & Niemela is new to China.