During a survey of wood-rotting fungi of the Changbai mountains in China a new poroid species of Hyphodontia (Basidiomycetes, Corticiaceae) was found on Syringa. Hyphodontia syringae is described, illustrated and compared with related species. The new species belongs to the H. crustosa group which is characterized by thin-walled cystidia, basidial repetition and the occurrence of poroid basidiocarps in some species. H. syringae is very closely related to H. apacheriensis, H. nothofagi and H. niemelaei.
