Coprinellus disseminatus, formerly known as Coprinus disseminatus and commonly known as the fairy inkcap,[1][2] fairy bonnet,[3] or trooping crumble cap,[4] is a species of agaric fungus in the family Psathyrellaceae.

Unlike most other coprinoid mushrooms, C. disseminatus does not dissolve into black ink (deliquesce) in maturity.

[5] Coprinellus disseminatus grows to 4 centimetres (1+5⁄8 in) tall.

The bell-shaped cap is tannish, becoming gray with age.

[2] The species is widespread across Europe, growing on rotting stumps.