Leucocoprinus is a genus of fungi in the family Agaricaceae. Its best-known member is the yellow pot-plant mushroom (Leucocoprinus birnbaumii), found worldwide. The type species is Leucocoprinus cepistipes. The genus has a widespread distribution and contains about 40 species. It includes some highly derived cultivars grown by the Acromyrmex and Atta leaf-cutting ants in an evolved ant–fungus mutualism.