 Mycena galericulata is a mushroom species commonly known as the common bonnet , the <unk> <unk> , or the <unk> @-@ 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 mushrooms have caps 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 <unk> conical to flattened with an umbo . 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 caps can reach 4 cm ( 1 @.@ 6 in ) in diameter , and have a <unk> odor and taste . The spore print is white and the gills are pink at maturity , which can lead to possible confusion with species of the <unk> genus . M. galericulata mushrooms grow mostly in clusters on the well @-@ decayed stumps of deciduous and coniferous trees from spring to autumn . The species can generally be considered inedible . It is common and widespread in the entire temperate zone of the Northern Hemisphere , but it has also been reported from Africa . 
