Lepiota procera le·pio·tap·rocera uncommon noun 1. edible long-stalked mushroom with white flesh and gills and spores; found in open woodlands in autumn Synonymsparasol mushroomLepiota procera Related words Broader terms agaric Parts genus Lepiota WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.