In the history of drug taking there have been fundamental discoveries that changed the way things were done. Ice hash, Butane extraction of hash oil, Ice water acetaminophen extraction, gargage synthesis of methaqualone, single pot methamphetamine synthesis The publication of "Opium for the masses", the PF tek, and the list goes on.
One of those pivotal events was a little book published in 1976 "psilocybin: Magic Mushroom Grower's Guide" By O.T. Oss and O.N. Oeric. Before the publication of this book one got mushrooms by knowing where they grew or by knowing someone who knew where they grew. This small book revolutionized the ability for the interested to launch themselves into inner space by their own hand. No need for a "connection", no need to wait years for a tiny button to grow. One can easily say that prior to 1976 mushrooms had not yet been "invented".