Mycena overholtsii is a species of
fungus in the family
Mycenaceae which produces mushrooms which are relatively large for its genus,
Mycena. The
caps reach up to 5 cm (2.0 in) in diameter, with
stems up to 15 cm (5.9 in) long.
M. overholtsii grows on well-decayed
conifer logs near snowbanks, during or just after
snowmelt. It is commonly found in North America, though it has also been reported in Japan.
Photograph: Noah Siegel, United States Forest Service