- Source: Cladonia albonigra
Cladonia albonigra (Bokmål: Svartfotbeger, Swedish: Svartvit bägarlav) is a species of fruticose lichen in the family Cladoniaceae. It can be found as far south as Canada and the United States, and as far north as the Arctic Circle. It prefers acidic soils, and is known to host on trees of the genus Thuja.