Shaggy scalycap is a fungus that grows usually at the base of old trees, but always in clusters.
Smells (and tastes) like a radish but, although not deadly, it is considered mildly toxic.
Dutch name : Schubbige bundelzwam
German name : Sparriger Schüppling
Latin name : Pholiota squarrosa
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A big thanks to [fc-user:1028107] for the nomination of this picture.