[1] Inocybe aeruginascens is a small mycorrhizal mushroom with a conic to convex cap which becomes plane in age and is often fibrillose near the margin.

The cap color varies from buff to light yellow brown, usually with greenish stains which disappear when the mushroom dries.

Inocybe aeruginascens is widely distributed in temperate areas and has been reported in central Europe and western North America.

[citation needed] It grows in moist sandy soils in a mycorrhizal relationship with poplar, linden, oak and willow trees.

The symptoms of "intoxication" were hallucinogenic, leading Gartz and Drewitz to eventually discover the first source of psilocybin in any Inocybe species.