Stropharia ambigua is [quite pretty](https://en.wikipedia.org/wiki/Stropharia_ambigua), and (as far as the literature shows) not known to be toxic. Because it tastes like old rotting leaves and dirt (source: me) it’s unlikely that anybody could (or at least would) eat enough to prove it one way or the other.
Many bracket fungi are as tough as the wood they grow on.
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