Published by the Botanic Garden and Botanical Museum (BGBM), Berlin-Dahlem, this Web site serves as on online guide to lichen identification. Users can choose from articulated identification keys for a large number of taxa, or follow links to keys organized by geographical region. There is also an interactive lichen identification database. The Web site has been recently updated to include a key for the genus Stereocaulon in Tropical America. Users should note that the keys listed are created by a number of different organizations, and thus vary in ease of use (some may not be available in English). The keys created by BGBM itself are simply presented and easy to follow, and should prove a useful resource for those pursuing lichen systematics.