Wild psilocybin mushroom identification — why this is serious and how to do it safely

The most important thing to know first: several deadly mushrooms grow in the same habitats and seasons as Pacific Northwest Psilocybe species. Galerina marginata — which looks extremely similar to Psilocybe cyanescens — contains amatoxins that cause fatal liver failure. There is no antidote. This is not a beginner forager situation. The stakes are genuinely lethal if you get it wrong. Get physically in the field with an expert before you consume anything you've identified yourself. Join a local mycological society — many do Psilocybe forays and the expertise level is high.

The three-character identification approach for Pacific NW Psilocybe: 1) Bluing reaction — the flesh and stem bruise blue/green within minutes of being broken or damaged. This is caused by psilocin oxidation and is the most reliable indicator. 2) Substrate — Psilocybe azurescens grows on woodchips and buried wood near the coast; Psilocybe cyanescens also on woodchip mulch. Neither grows on dead wood stems the way Galerina does. 3) Spore print — Psilocybe: dark purple-brown to black. Galerina: rust-brown. All three features must be confirmed. A single characteristic is not sufficient.

Resources for the PNW: Paul Stamets' 'Psilocybin Mushrooms of the World' is the essential reference. The Pacific Northwest Key Council (PNWKC) publishes good regional identification guides. iNaturalist has expert-reviewed ID resources. The Shroomery's Taxonomy & Identification forum has experienced people who review photos. Post multiple high-quality photos (cap, gills, stem, spore print, bluing reaction) before drawing any conclusions about what you have.