This association includes vegetation of calcareous fens, dominated by short sedges and developed on organic fen peat. These fens are usually of modern origin, and they are developed and maintained under regular mowing regimes or light livestock grazing. Species of wet Calthion palustris meadows and acidophytes occur in many stands. Carex davalliana is present on most sites and usually dominates. The moss layer is species-poor and lacks both the Sphagnum species and brown mosses typical of other associations with Carex davalliana, e.g. Palustriella commutata or Scorpidium cossonii. Localities of this association in the Czech Republic are concentrated in the eastern Labe lowland and adjacent foothill areas, and in foothills of the Šumava Mountains.