Circumpolar Arctic Vegetation Unit B2
- About the Vegetation Map Units
- Bioclimate Subzones
- Floristic Provinces
- Lake Cover
- NDVI and Phytomass
- Substrate Chemistry
Canadian shield near Daring Lake. Photo D.A. Walker.
B2. Cryptogam barren complex (bedrock)
Areas of exposed rock and lichens interspersed with lakes and more vegetated areas, as found on the Canadian Shield. Subzones C and D.
Bedrock covered with lichens, usually mixed with many lakes and the zonal vegetation. The largest areas are on Precambrian granite and gneiss bedrock of the Canadian Shield, but also in the high elevation areas of Siberia, northeast Asia, Alaska, and Greenland, which are mapped as part of the mountain complex (Unit B3 and Unit B4). Areas between bedrock outcrops commonly have dwarf shrubs and fruticose lichens. Found in Subzones C and D.
Area: 372 x 1000 km2.
Communities of the class Rhizocarpetea geographici Wirth 1980 (Canada, on granite bedrock).
- Saxicolous lichens: Lecidia; Lecanora; Buellia; Porpidia; Rhizocarpon; Umbilicaria; Parmelia; Xanthorian; Caloplacan; Aspicilian;
- Tree/shrub: Betula; Ledum palustre spp. decumbens; Arctous alpina; Cassiope tetragona; Vaccinium;
- Grass: Hierochloe alpina;
- Terricolous lichens: Cladonia; Cladina; Flavocetraria; Masonhalea richardsonii; Stereocaulon; Bryocaulon divergens; Alectoria ochroleuca;