Rhynchospora alba-rich formations of transition mires of the Palaearctic domaine, with Drosera anglica, Drosera intermedia, Drosera rotundifolia, Vaccinium oxycoccos, Carex limosa, Carex rostrata, Sphagnum recurvum and sometimes with Eleocharis quinqueflora, Eriophorum latifolium, Andromeda polifolia or Scheuchzeria palustris.