Psathyra Psilocybe Pileus hemispheric, 2.5diameter, 2cm. high, slightly umbonate, smooth dry, between vinaceous buff and olive buff or lighter; flesh thin, concolorous Gills medium to subdistant, subnarrow, concolorous Stipe 2mm. x 14cm., silky, innate fibrillose, russet above, Mars brown below, cartilaginous, hollow On decaying manure in potrero n.e. of barn Costa Rica, San José prov, Guayabillos, 2300m 7-8-36 Dodge & Goerger