Megacollybia platyphylla, also know as Broad-gilled Collybia, is a medium to large, fleshy agaric that has a pale brown, fibrillose cap, whitish gills and stem. It grows solitarily or in small groups on and near deciduous hardwood trunks, branches or woody debris. Less commonly on conifer timber.

Cap mid- to pale brown, convex to umbonate. It has radiating fibers on dry cap surface. Gills medium-spaced, adnate or notched. Spores are pale cream colored. Stem hollow at center and whitish, with darker fine fibrils that are less dense than on cap. It is more or less equal and thickened at base. It has no ring.

Similar species Pluteus cervinus has free gills and a salmon-pink spore print.

Megacollybia platyphylla on the www.first-nature.com web site.