Cracked Cap Polypore

''Phellinus robiniae'', commonly called the cracked cap polypore, is a fungus of the family of Hymenochaetaceae. The fungus primarily infests black locusts, aided by openings caused by ''Megacyllene robiniae'' infestation, but also grows on various other trees such as ''Carya'', oak, and ''Acacia''.