Mycena purpureofusca, commonly known as the purple edge bonnet, is a species of agaric fungus in the family Mycenaceae.

First described by Charles Horton Peck in 1885, the species is found in Europe and North America, where it grows on the decaying wood and debris of conifers, including cones.

[8] Rolf Singer put it in the section Rubromarginata in his 1986 The Agaricales in Modern Taxonomy, a group characterized by having distinct red marginate gills.

[9] The specific epithet purpureofuscus combines the Latin words purpur (purple) and fusco (dark or dusky).

Its color is dark purple in the center, fading to pale lilac at the margins; older specimens are purplish-gray.

M. californiensis (formerly M. elegantula) is similar, but has gill edges colored rosy to vinaceous-brown, and its cap is browner than that of M. purpureofusca.

[8] It has an orange to orange-brown cap, a stipe the exudes red juice when injured, and grows in lead litter under oaks.

[12] In his original protologue, Peck mentioned that he considered the species closely related to M. rubromarginata, but could be distinguished by its darker color and "non-hygrophanous striate pileus.

[2] The fruit bodies of Mycena purpureofusca grow singly or in clusters on the decaying wood of conifers,[8] particularly spruce, pine, and Douglas-fir.

Smith noted that collections from Michigan are likely to be found on old hemlock knots lying in the soil, where it usually fruits singly; it tends to grow in clusters on logs and stumps.

[8] In Europe, it has been recorded from Britain,[18] Scotland,[19] the Czech Republic,[16] Poland,[20] Germany,[21] Turkey[22] and Austria (Mykologische Datenbank (pilzdaten-austria.eu)).

In the UK, the fungus is commonly found in Caledonian pine woods,[23] and it is considered an indicator species for that habitat type.