Another one I spotted while in Fundy NP in New Brunswick - would also like to know what it is please?
And another unknown one in Fundy NP, Maine?
Could it be , or closely related to Bracket Shelf Fungi - Ganoderma applanatum
http://en.wikipedia.org/wiki/Ganoderma_applanatum
Looks like Sulphur Shelf Fungus, Laetiporus sulphureus.
http://americanmushrooms.com/edibles4.htm
http://www.chicagowildernessmag.org/issues/fall2003/sulphurshelf.html