How to identify it?
Cap
Cap 1.5-5 cm across, convex then flattened; yellowish brown; surface smooth; stain blue when touched or otherwise disturbed. Flesh thin, brittle, turns blue when damage. Odour and taste not distinctive.
Gills
Gills adnate, light brown to dark purple brown, close.

Scientific Classification

Phylum
Club fungi Class
Mushroom-forming fungi Order
Gilled fungi Family
Hymenogastraceae Genus
Psilocybe Species
Wavy caps