This looks very much like a remnant of Laetiporus portentosus that has fallen from a nearby tree. These remnants often look like styrofoam because what was originally a bracket has been eaten by insects. Maybe after the fire this was one of the few food sources left for the insects to eat. If you look under species and go to fungi there is some information about this fungus. Unfortunately the image there is not all that representative of the fungus on a tree.
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