Coprinellus impatiens

''Coprinellus impatiens'' is a species of fungus in the Psathyrellaceae family. First described in 1821, it has been classified variously in the genera ''Psathyrella'', ''Pseudocoprinus'', ''Coprinarius'', and ''Coprinus'', before molecular phylogenetics reaffirmed it as a ''Coprinellus'' species in 2001. The fungus is found in North America and Europe, where the mushrooms grow on the ground in deciduous forests. The fruit bodies have buff caps that are up to 4 cm in diameter, held by slender whitish stems that can be up to 10 cm tall. Several other ''Coprinopsis'' species that resemble ''C. impatiens'' may be distinguished by differences in appearance, habit, or spore morphology.