Notes and Reflections on Books and Media
by Hannah Leitheiser
The Story Book of Science
Jean Henri Fabre
'"You are going to teach us to distinguish the good from the bad?" asked Mathieu.'"
tl;dr: They're all edible if you're not a wimp.
Actually the claim is that '"What is poisonous in mushrooms is not the flesh, but the juice with which it is impregnated. Get rid of that juice, and the injurious properties will disappear immediately. This is accomplished by slicing and cooking the mushrooms, either dried or fresh, in boiling water with a handful of salt. They are then drained in a colander and washed two or three times in cold water.' (The Story Book of Science, Jean Henri Fabre).
Although if after doing that, you find out you're a wimp, you have only yourself to blame.