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Meripilus giganteus
Growing on deadwood, deciduous tree stump.
@Michelle: not a problem, I'm thankfull for every suggestion.
@Vlad: you're right, the color seems not really fitting for sulphur polypore. I went back to that place to check again but the mushroom was gone. However, it revealed that there actually was a tree stump underneath.
OOPS... I suppose this makes me guilty of not reading all the info on the suggestion! It looked like one, and I just assumed... I'll read better next time! :-)
Michelle, thanks for the hint. However, trametes grows on dead wood and are usually not so fleshy as this specimen was.