Image source: Wikipedia Psilocybe cyanescens
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Common Names: Wavy Cap, Cyan, Blue Halo
Pileus: Cap 2-4.5 cm broad, convex, becoming nearly plane with a low umbo; margin striate, often wavy, sometimes upturned in age; surface smooth, sticky when moist, hygrophanous, brown, fading to yellow-brown or buff; flesh thin, brittle in age, bruising blue.
Gills: Gills adnate to seceding, close when young, subdistant in age, pale cinnamon brown, becoming dark grey-brown, edges lighter than the faces, mottled from spores at maturity.
Stipe: Stipe 3-6 cm tall, 3-6 mm thick, equal to sometimes enlarged at the base, the latter with conspicuous thickened mycelium (rhizomorphs); surface white, smooth to silky, bruising blue; veil fibrillose, forming a superior, evanescent hairy, annular zone.
Spore print: Purple-brown to purple-gray or purple-black; Spores 9-12 x 6-8