How to identify it?
Cap
Cap 5-10 cm across, convex or irregularly at first, becoming broadly convex, broadly bell-shaped, or nearly flat; white or grayish white; surface smooth and silky. Odour and taste not distinctive.

Scientific Classification

Phylum
Club fungi Class
Mushroom-forming fungi Order
Gilled fungi Family
Agaricaceae Genus
Leucoagaricus Species
White dapperling