Conocybe filaris

Conocybe filaris is a common lawn mushroom which is widely distributed and especially common in the pacific northwest. It contains the same mycotoxins as the death cap. It is also known as Pholiotina filaris.

Description
Conocybe filaris has a cap which is conical, expanding to flat, usually with an umbo. It is less than 3 cm across, has a smooth brown top, and the margin is often striate. The gills are rusty brown, close, and adnexed. The stalk is 2 mm thick and 1 to 6 cm long, smooth, and brown, with a prominent and movable ring. The spore print is rusty brown.

Habitat
Common and widely distributed on lawns and wood chips.