Leucocoprinus brebissonii is a small, delicate mushroom with thin white flesh that is brittle and prone to splitting at the cap edges.

Cap: 2-3cm wide and starting hemispherical or bulbous before flattening with age with a small dark brownish umbo which is often quite shallow.

Distinct, deep striations or grooves spread from the edges of the cap to around halfway up the surface or almost to the disc.

[7][8][4] Leucocoprinus brebissonii is found in Europe and North America from summer to fall, where it grows in the soil in woods with deciduous trees.

In 1874 Godey documented Lepiota brebissoni growing in the Cerisy Forest of the Calvados region of France during the summer.