Cap 2-5 mm broad, convex, broadly so to plane in age, occasionally with the disc depressed; margin decurved, sometimes becoming plane, often sulcate; surface minutely pruinose (use hand lens), striate wrinkled to two-thirds the distance from the margin to the disc; color light-brown at the disc, pallid to cream-buff at the margin; context very thin, pallid; odor mild, taste: untried.
Gills adnexed, subdistant, moderately broad, whitish, lamellulae 1-2 seried.
Stipe 1-2.5 cm long, less than 1 mm thick, round, hair-like, equal, sometimes flexuous; surface at apex pallid to pale vinaceous-brown, sparsely pruinose, elsewhere glabrous, reddish-brown to dark-brown, instititious on leafy substrate, scattered rhizomorphs near base.
Spores 7.5-9.0 x 3-4.5 µm, ellipsoid to almond-shaped, smooth, nonamyloid, hyaline in KOH; spore print not seen.
Solitary to gregarious on rotting hardwood leaves, notably species of oak (Quercus) and tanbark oak, (Lithocarpus densiflora); fruiting shortly after the fall rains.
Unknown; too small to have culinary value.
Marasmius quercophilus fruits on oak and tanbark leaves. Often up to a dozen fruiting bodies of this Lilliputan species may occupy the same leaf. It's distinguishing macroscopic characters are a pale, striate-wrinkled, minutely pruinose cap with a brownish disc, distant gills, a mostly dark-brown polished, hair-like stipe, and a lack of distinctive odor. Like many Marasmius species, it is capable of rehydrating to its original size and shape after drying.