Abstract
Based on 43 taxa, the relationships of the European poroid Hymenochaetales were examined by molecular sequence data of a region of the large subunit of the nuclear-encoded ribosomal DNA. The molecular data were discussed referring to morphological and anatomical features of the fruit bodies, nuclear behaviour of the vegetative mycelium, and the pattern of reproduction. As a result, the genera Phellinus s. lat. and Inonotus s. lat. are subdivided into five subunits each. The following genera are accepted: Phellinus s. str. ( P. igniarius group), Porodaedalea ( P. pini group), Fomitiporia ( P. robustus group), Fuscoporia ( P. ferruginosus and relatives, including P. torulosus and P. wahlbergii ), Phellinidium ( P. ferrugineofuscus and relatives), Phylloporia (P. ribis) and Inonotus s. str. ( I. hispidus and relatives), Inocutis ( I. rheades group), Mensularia ( I. radiatus and relatives), Pseudoinonotus gen. nov. ( I dryadeus and relatives), and Inonotopsis (I. subiculosus). Their relationships to non-European members of these groups are discussed. Onnia and Coltricia were confirmed as separate genera. Phaeolus schweinitzii was placed outside of the Hymenochaetales.
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