
Appearance
Cap: 1-3.5 cm across, convex, becoming broadly convex; smooth or somewhat wrinkled; the margin sometimes lined; yellowish brown to reddish brown, sometimes fading dramatically along the margin.Gills: Attached to the stem; distant or nearly so; pale at first, becoming tan, or even light brown; sometimes developing brown edges.
Stem: 3-8 cm long; up to 3 mm thick; equal; dry; straight or slightly curved; whitish to yellowish brown at first, but soon darkening from the base up to dark brown or dark reddish brown; usually with copious, whitish basal mycelium.

Habitat
Saprobic on leaf litter and woody debris in hardwood forests (primarily oak-hickory and beech-maple woods, but also in hemlock forests where beech is present); growing alone or in clusters; early summer through fallReferences:
Some text fragments are auto parsed from Wikipedia.
https://www.mushroomexpert.com/marasmius_cohaerens.html