All mushrooms are edible, but some only once.
I originally heard a variant of that proverb: "All plants are edible, but some only once." Who originally figured out which mushrooms are edible and which will kill you? Some brave souls! Mushrooms today.
Mushroom cave, 1875
Popular Science Monthly Volume 7
Giuseppe Arcimboldo (1527–1593)
Mushroom war, 1909
"A Fungus to Feed Us" can structure, NY local Canstruction competition