Tortula cuneifolia (Dicks.) Turner, a submediterranean species, was found in Russia in Anabar Plateau in subarctic East Siberia. This is the northernmost of Eurasian localities of the species situated in more than 3000 km from the nearest locality in Tian-Shan Mountains in Middle Asia. The paper provides description and illustrations of plants that represent apparently a relic population occurring in xerophytic communities of North Siberia. A distinction of T. cuneifolia from similar species is discussed.