Forests of Betula pubescens or B. carpatica on peaty, humid and very acid soils, colonizing bogs of reduced peat building activity and acid fens, with Molinia caerulea, Vaccinium uliginosum, V. myrtillus, Empetrum nigrum, Trientalis europaea and many sphagnums, mosses and liverworts.
Sphagnum-rich Betula pubescens or B. carpatica woods in which bog species, in particular Eriophorum vaginatum and Vaccinium oxycoccos, are prominent.