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We propose a taxonomic revision of the two closely related white-rot polypore species,    Skeletocutis   nivea    (Jungh.) Jean Keller and    S.   ochroalba    Niemelä (  Incrustoporiaceae  ,   Basidiomycota  ), based on phylogenetic analyses of nuclear ribosomal internal transcribed spacer ( ITS ) and translation elongation factor EF-1α sequences. We show that prevailing morphological species concepts of    S.   nivea    and    S.   ochroalba    are non-monophyletic and we delineate new species boundaries based on phylogenetic inference. We recognise eleven species within the prevailing species concept of    S.   nivea    (   S.   calida    sp. nov. ,    S.   coprosmae    comb. nov.,    S.   futilis    sp. nov. ,    S.   impervia    sp. nov. ,    S.   ipuletii    sp. nov. ,    S.   lepida    sp. nov. ,    S.   nemoralis    sp. nov. ,    S.   nivea    sensu typi,    S.   semipileata    comb. nov.,    S.   unguina    sp. nov.  and    S.   yuchengii    sp. nov. ) and assign new sequenced epitypes for    S.   nivea    and    S.   semipileata.    The traditional concept of    S.   ochroalba    comprises two independent lineages embedded within the    S.   nivea    species complex. The Eurasian conifer-dwelling species    S.   cummata    sp. nov.  is recognised as separate from the North American    S.   ochroalba    sensu stricto. Despite comprehensive microscopic examination, the majority of the recognised species are left without stable diagnostic character combinations that would enable species identification based solely on morphology and ecology.

Cryptic species diversity in polypores: the Skeletocutis nivea species complex