How to identify it?
Cap
Cap 1.5-3 cm across, convex; dull yellow-brown to purplish brown; surface hygrophanous, smooth. Flesh thin, brownish. Taste slightly unpleasant nutty mushrooms.
Gills
Gills narrowly adnexed, grayish to brownish, becoming dark brown and mottled in age, close or nearly distant, with whitish edges.

Scientific Classification

Phylum
Club fungi Class
Mushroom-forming fungi Order
Gilled fungi Genus
Panaeolina Species
Mower's mushroom