Possibly Hemlock varnish shelf (Ganoderma tsugae)
Young brackets may have white edges but these darken in older specimens.
http://www.mushroomexpert.com/ganoderma_tsugae.html
http://www.messiah.edu/oakes/fungi_on_wood/poroid%20fungi/species%20pages/Ganoderma%20tsugae.htm
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