Psilocybe azurescens field identification — features and lookalikes

P. azurescens identification: caramel-colored cap (hygrophanous — fades to pale straw as it dries), distinctly wavy or undulating cap margin, broad umbo (raised central bump), whitish gills with dark purple-brown spore print, silky-fibrous stem often with basal mycelial mat. Bluing on damage is very strong — one of the most potent bluing reactions of any species. Found in coastal dune grass and wood chips, October–February in the PNW.

Galerina marginata comparison: similar cap color and habitat (wood debris), but key differences: (1) Galerina has a ring (annulus) on the stem — azurescens lacks this; (2) Galerina spore print is rusty-brown, not dark purple-brown; (3) Galerina does not blue on damage; (4) Galerina grows more on woody debris (sticks, stumps) while azurescens prefers buried wood chips and sandy soil near grass. If you see a ring on the stem, set it down. Galerina contains amatoxins and can be lethal.

Critical note: don't rely on any single feature. Confirm: (1) strong bluing, (2) dark purple-brown spore print on paper overnight, (3) no ring on stem, (4) coastal habitat with sandy soil or wood chips. All four together with a physical field guide comparison. The fact that azurescens is highly potent means a misidentification is particularly dangerous in both directions — Galerina poisoning or unexpectedly intense experience. Don't rush this identification.