Psilocybin-containingBolbitiaceaeNorth AmericaEuropeAustraliaNew Zealand
Panaeolus olivaceus
Olive mottlegill
Weakly active grassland mottlegill with an olive tint, common on lawns and pasture.
Regional status: Widespread in temperate grassland
- Cap
- Convex, 10–35 mm, olive-brown to grey-brown, hygrophanous.
- Gills
- Adnate, mottled grey then black.
- Stem
- 40–90 mm, slender, brownish, rarely blueing.
- Flesh
- Thin, brownish.
- Spore print
- Jet black
- Habitat
- Grass, pasture and manured lawns.
- Distribution
- North America, Europe and Australasia.
- Season
- Spring – autumn
- Bruising
- Little or no blueing.
- Odour
- Mild
- Potency
- Weak
Key features
- ▪Mottled black gills
- ▪Olive-toned cap
- ▪Slender grass-dwelling habit
Field tests
- Jet black spore print
- Compare with purple-brown printing Psilocybe
Edibility
Weakly psilocybin-containing; not a food species.
Warning
Easily confused with toxic grassland species; potency is variable and unreliable.
Photo and feature-based identification is probabilistic. Never consume a wild mushroom on the basis of an app result — confirm with an experienced mycologist.