Armillaria Pileus expanded, 10 cm., depressed, margins wavy, striate, unrolled when young broadly umbonate in depression, Mars brown, lighter toward margin, even, honey color, minutely fibrilloose, scaly, flesh thin, except on disc; gills decurrent by a line, adnate, ochraceous-salmon, darker in age, narrow, close; stipe fibrous, stuffed, tapering downward, 6 cm. # 11 mm. above, 5 mm. belwo, silky, fibrous with floccose warts just below & on under- side of lacerate, fleshy, fibrous annulus. Stump in potrero Specimens examined: Costa Rica, San Jose, Rancho Redondo, Alt. 2200m. Dodge & Thomas 5043, 5406