Cap 2-8 mm broad, hemispheric becoming convex; margin decurved, slightly undulate; surface moist, faintly pruinose when young, soon glabrous, translucent-striate, indistinctly so when dry; bright yellow, sometimes yellow-orange at the disc, fading to pale yellow or almost white; context thin, yellowish, unchanging; odor and taste mild.
Gills adnate to subdecurrent, subdistant, pale yellow, non-marginate; lamellulae 1-2 seried.
Stipe 1-2.5 cm long, < 1mm thick, fragile, more or less equal; surface pruinose, translucent yellow, instititious, i.e. inserted on conifer needles and leaves of hardwoods; veil absent.
Spores 6.5-8.5 x 3-3.5 µm, tear-shaped, smooth, nonamyloid; spore print white.
Solitary to gregarious on rotting conifer needles and leaves of hardwoods, e.g. coast redwood (Sequoia sempervirens), and tanbark oak (Lithocarpus densiflora).
Unknown; too small to have culinary value.
This tiny Mycena can be distinguished from the numerous other small litter decomposers that inhabit local woodlands by a bright yellow cap and similarly colored, extremely thin, fragile, pruinose stipe. It is most likely to be confused with a close cousin, Mycena acicula, a species with a orange to orange-red cap.