[DE](2012) Leucocoprinus tenellus is a species of mushroom producing fungus in the family Agaricaceae.

[1][2] It was first described in 1905 by the French mycologist Jean Louis Émile Boudier who classified it as Lepiota tenella[3] accompanied with illustrations of the species.

[DE] described Leucocoprinus emilei however Species Fungorum notes this as an illegitimate name which was based on the basionym Lepiota tenella.

Boudier provides the following description of the species: Cap: Starts campanulate (bell shaped) and covered in woolly (floccose) violet scales before expanding and becoming white with small violet scales clustered in the centre disk and only sparsely dotted across the rest of the surface.

[3] Whilst Boudier describes the colour as violet in the original text his illustration[4] appears more brown.