The Cortinariaceae are a large family of gilled mushrooms found worldwide, containing over 2100 species. The family takes its name from its largest genus, the varied species of the genus Cortinarius. Many genera formerly in the Corinariaceae have been placed in various other families, including Hymenogastraceae, Inocybaceae and Bolbitiaceae. The deadly toxin orellanine has been found in at least 34 Cortinariaceae.