Psilocybe stuntzii

Small to medium psilocybin-producing mushroom of the Pacific Northwest. Famously fond of well-watered urban lawns and wood-chip beds, which has given it the colloquial name "the lawnmower's mushroom". Caution: deadly Galerina marginata grows in the same habitat and is easily confused with it.

Wood chips, bark mulch, and well-watered lawns in the Pacific Northwest from late summer through autumn.

Named for Dr. Daniel Stuntz, a mycologist at the University of Washington. The lookalike risk with Galerina marginata, which contains lethal amatoxins, is the most important practical fact about this species — even experienced foragers have been killed by misidentification.