There's a delicious mushroom I regularly pick/eat and that is very popular throughout most of the world (Amanita sec. caesarae) that requires five different sig

There's a delicious mushroom I regularly pick/eat and that is very popular throughout most of the world (Amanita sec. caesarae) that requires five different significant criteria to identify. If any of those criteria are different, the mushroom you're seeing is going to make you sick or kill you. Who figured this out? It was fairly easy for me to learn in the age of the Internet, but who were these generations of people who figured that out? Seems insane.