Transition mire communities of boreal and western nemoral regions of the Palaearctic domaine dominated by Carex rostrata accompanied by basiphilous sphagna, Sphagnum contortum, Sphagnum teres, Sphagnum warnstorfii, Sphagnum squarrosum. They are most characteristic of boreal regions, restricted at lower latitudes to the montane to subalpine belts.