Armillaria Pileus expanded, moist, slightly viscid( remains of universal veil present, since soil clings to stipe from position ocupied by margin of pileus to end) russet, slightly lighter arround faintly except striate margin; flesh thin on disc gills adnate with decurrent line to annulus, pinkish, medium width, close, regularly interveined stipe fleshy, 3 cm x 8 mm, innate fibrilloose, annulus fibrilloose, persistent Bank by roadside among mosses Specimens examined Costa Rica: San Jose, Rancho Redondo, 2500m, Dodge &Thomas 5133