The USDA-ARS U.S. National Fungus Collections (BPI) currently houses approximately one-million reference specimens. Data associated with over 925,000 specimens have been computerized and are available on-line. In addition reports of fungi on plants provide a comprehensive account of the host range and geographic distribution of fungi on plants throughout the world. Data are continuously added to the databases from herbarium specimens and newly published fungus-host distributions and disease reports. Additional databases contain taxonomic literature references and accurate scientific names of plant pathogenic fungi.