Acidophilous forests of Fagus sylvatica, Fagus sylvatica and Abies alba or Fagus sylvatica, Abies alba and Picea abies of the montane and high montane levels of the Vosges, the Black Forest, the Odenwald, the French and Swiss Jura, accompanied by sub-Atlantic species and characterized in particular by the presence of Digitalis purpurea, less developed and generally more transformed by exploitation than those of unit G1.6121.