Ravine forests on siliceous screes and colluvions of the great western Hercynian ranges, the Ardenne-Eifel system, the mid-German Hercynian ranges, the Harz, the southwestern Bohemian Quadrangle, dominated by Tilia platyphyllos, Tilia cordata, Acer pseudoplatanus, Acer platanoides, Quercus petraea, Carpinus betulus, Ulmus glabra, with an impoverished cortège that includes, with ravine forest species, acidophilous Fagetalia species, including Luzula luzuloides, Vaccinium myrtillus, Deschampsia flexuosa, and an abundance of acidophile ferns and mosses.