Clitocybe robusta 

Clitocybe robusta Peck 1896

The ‘robust clitocybe’ is white to buff, convex becoming broadly convex to near infundibuliform with a depressed center and a pale pubescent margin. Its gills are white to buff, very close, slightly broad, and subdecurrent. The stipe is somewhat fibrillose, stuffed becoming hollow, with copious mycelium connecting it to its substrate. It can be found from late summer through October in mixed woods. Its spore print is off-white to pale yellowish. It is a saprotrophic fungus that often grows gregariously. Unpleasant odor. Not edible.  It is in the Tricholomataceae family of the Agaricales order.