Stemmed and vanished conks of this species complex are widespread. Known as Reishi or Lingzhi in the orient, they are of ongoing medicinal interest. In context at www.dixpix.ca/Amazon/fungi/index.html
Possibly the same as G. tsugae, and possibly medicinal. Photo from near Sechelt, British Columbia. One of the "American Reishi", relating to a famous oriental species.