Coprinellus disseminatus.Fairy Bonnets.

Coprinellus disseminatus (formerly Coprinus disseminatus; commonly known as "fairies bonnets" or "trooping crumble cap") 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. The species was given its current name in 1939 by Jakob Emanuel Lange. The mushroom is edible but not worth eating.