An attempt was made to more clearly differentiate the Arctic (tundra) and the boreal biomes of the Barents Sea coast of northern Fennoscandia using the example of the clavarioid fungi (Basidiomycota, Aphyllophorales) complex. The high role of the arcto-alpine element among the active species and in the overall checklist, together with the parameters of the taxonomic, chorologic, trophic and morphologic structure of the «treeless» areas suggests that they belong to the southern hypoarctic tundra. It is an argument in favor of including the area into the Arctic region. On the other hand, according to most of the criteria, the fungal biota of forested areas with their pine-birch open woodland has the boreal structure.