The collection consists of about 350,000 lichen specimens. We have important collections from Norway (120,000, fully computerized), Iceland, the Arctic (especially Greenland, Jan Mayen, Bear Island, Svalbard, and Novaya Zemlya), Macaronesia, and East Africa (especially Ethiopia, Kenya, Tanzania, and Uganda). The material includes, e.g., the collections of Mathias Numsen Blytt (1789-1862), Søren Christian Sommerfelt (1794-1838), Niels Green Moe (1812-1892), Johannes Musæus Norman (1823-1903; part), Bernt Lynge (1884-1942), Eilif Dahl (1916-1993), and Hildur Krog (1922-2014). So far about 1,500 lichen types have been identified.