Mycena galopus var. nigra, Heeswijk-Dinther forest, Netherlands

Mycena galopus, commonly known as the milking bonnet or the milk-drop Mycena, is an inedible species of fungus in the Mycenaceae family of the Agaricales order. It produces small mushrooms that have grayish-brown, bell-shaped, radially-grooved caps up to 2.5 cm (1.0 in) wide. The gills are whitish to gray, widely spaced, and squarely attached to the stem. The slender stems are up to 8 cm (3.1 in) long, and pale gray at the top, becoming almost black at the hairy base.