Exsudoporus permagnificus
It forms ectomycorrhizal associations with oaks ( "Quercus" ) , particularly "Quercus suber" , "Quercus ilex" , "Quercus pubescens" , "Quercus alnifolia" , "Quercus pyrenaica" and less often with sweet chestnut ( "Castanea sativa" ) . 
<triplet> Quercus suber <subj> Quercus <obj> parent taxon <triplet> Quercus ilex <subj> Quercus <obj> parent taxon <triplet> Quercus pubescens <subj> Quercus <obj> parent taxon