Polyporus tuberaster --- Tuberous Polypore

This Tuberous Polypore Polyporus tuberaster from Pembrey Country Park was on Hazel.  It is found on a wide variety of 'hardwoods'. There is a good page on 'First Nature', Pat O'Reilly's site where he describes it as an 'infrequent' find.  If found growing on the ground this is said to be from a blackish sclerotium which I have never seen.