Acidophilous beech forests with a species-poor herbaceous layer, of the planar to colline zones (here often with Quercus petraea, Quercus robur in the tree layer), and into the montane zone (with tall herbaceous plants in the herbaceous layer). They include near-natural beech forests of the lowlands which are sometimes described as separate associations. These also include beech-rich facies of the Fago-Quercetum. In terms of altitudinal belts the beech-fir forests and the beech-fir-spruce forests of the montane zone ('montane mixed forests' of base-poor soils) are included, but not the Aceri-Fagetum of the upper montane to subalpine zone (separate habitat type 9140).