How to identify it?
Cap
Cap 2-8 cm across, convex to flat, weakly umbonate; dingy buff to tan, becoming browner with age; surface finely fibrous; with fibrous veil remnants hanging from the margin. Flesh thin, white to light brown. Odour and taste not distinctive.
Gills
Gills free to adnexed, yellow-brown, crowded, with pale edges.

Scientific Classification

Phylum
Club fungi Class
Mushroom-forming fungi Order
Gilled fungi Family
Coprinaceae Genus
Lacrymaria Species
Weeping widow