Mycena aurantiomarginata

Pileus
Cap 1.0-2.0 (2.5) cm broad, obtuse-conic to bell-shaped, expanding to plano-convex, often with a low umbo, margin decurved; surface dry, translucent-striate to sulcate, sometimes with a faint whitish bloom when young; color: dark-brown to deep olive-brown at the disc, lighter towards the margin, the latter typically some shade of orange when young, fading to cream-buff at maturity, paler overall in age; context very thin, approximately 1.0 mm at the disc, whitish to watery-brown; odor not distinctive, taste mild.

Lamellae
Gills adnexed to notched with a descending tooth, close, thin, faces cream-yellow, edges apricot-orange; lamellulae up to 3-seried.

Stipe
Stipe 2.5-7.0 cm long, 1-2 mm thick, equal, slender, cartilaginous, stuffed to hollow at maturity; surface of apex glabrous to pruinose, yellowish, elsewhere glabrous, dull yellow-brown, olive-brown, the base with conspicuous yellow-brown to orange-brown hairs; partial veil absent.

Spores
Spores 7.5-9.0 x 4.0-5.5 µm, ellipsoid, amyloid; spore print white.

Habitat
Scattered to gregarious in conifer duff; fruiting from late fall to early winter.

Edibility
Unknown, insignificant.

Comments
This attractive Mycena is recognized when young by an orange-tinged, brownish cap. In age, the orange coloration which typically is concentrated near the margin fades, but it can still be distinguished by pale yellowish gills with apricot-orange margins, the latter the basis for the species name.