Cap: 16-22mm wide when mature, campanulate when young but flattening or becoming convex with age with edges which may lift upwards.

The surface is pure white with a slightly umbonate disc which has very fine grey, purple and black tones densely concentrated in the middle.

Stem: Smooth, 12-35mm long, 5 cm at most and 2mm thick tapering from a slightly bulbous 5mm base where traces of white mycelium are present.

[5] A 2014 study of mushroom species found in botanical gardens in Poland documented L. heinemannii growing in a group under Dichondra and Euphorbia plants during several months of the year.

The specific epithet heinemannii is named for the Belgian mycologist Paul Heinemann who classified numerous Leucocoprinus species in 1977.