GOOSE: Yes you are completly right. It is Birch polypore, and it has loads of uses.
Two that I have done are
Colds and sore throats; Slice off a peice. boil it for 30 mins with the lid on. inhale vapour for a blocked nose and gargle liquid for sore throat. It tastes terrible but it works.
Coal fungus/ember keep: Dry out fungus. slice off stipe and place ember on inner flesh. keeps burning for hours and keeps insects away.
It contains an antiseptic and alot of tannins(stypic). It tastes like TCP soaked cotton wool.
Looking at the pictures carefully something wierd is going on to fungus in the first picture. It has morbid obesity of something.