Lichenes externi is part of the lichen collections of the Finnish Museum of Natural History. This collection contains lichen specimens worldwide (except for Finland and Russian Fennoscandia) and is especially strong in specimens from boreal and temperate Europe, Asia and North America. Taxonomically the families Cladoniaceae, Parmeliaceae and Peltigeraceae are well represented. Type specimens are being digitized and transferred into a separate Lichen type collection.
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