Mycena galericulata is a mushroom species commonly known as the common bonnet, the toque mycena, the common mycena or the rosy-gill fairy helmet. The type species of the genus Mycena was first described scientifically in 1772, but was not considered a Mycena until 1821.

It is quite variable in color, size, and shape, which makes it somewhat difficult to reliably identify in the field. The caps can reach 4 cm (1.6 in) in diameter, with distinct radial grooves, particularly at the margin. The cap's color varies from grayish brown to dark brown and the shape ranges from bell-like to bluntly conical to flattened with an umbo. The cap's flesh has a mealy odor and taste. The stem is hollow, white, tough and thin, without a ring and often roots deeply into the wood on which it grows. The gills are white to grayish or even pinkish when mature and are connected by distinct cross-veins. The spore print is white and the gills are pink at maturity, which can lead to possible confusion with Pluteus species.

M. galericulata mushrooms grow mostly in clusters on the well-decayed stumps of deciduous and coniferous trees from spring to autumn. It is common and widespread in the entire temperate zone of the Northern Hemisphere, but it has also been reported from Africa. It is possibly edible but of little interest.

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