"Seeking the Magic Mushroom" is a 1957 photo essay by amateur mycologist Robert Gordon Wasson describing his experience taking psilocybin mushrooms in 1955 during a Mazatec ritual in Oaxaca, Mexico. W
Psilocybe caerulescens var. caerulescens. Wasson ingested this species on June 29, 1955. The experience became the basis for his 1957 essay.