Armillaria 7-8 cm Pileus expanded broadly umbonate, disc minutely scaly, cinnamon brown shading to cinnamon buff, margin striate sulcate; gills pinuate adnate broad, close, pale pinkish cinnamon; stipe fibrous, cottony below, somewhat evanescent annulus, tapering or equal 7 x 1 cm Forming fairy ring around old decaying stump specimen from zurqui agrees except pileus 6cm or less stipe 6cm x 9mm. covered with cottony veil Specimens examined Costa Rica: San Jose, Rancho Redondo, N 2200 m Dodge&Thomas 5408 Heredia: Cerro Central de Zurqui, 1600 m Dodge Valerio Thomas