Forests of Quercus robur or Q. petraea on acid soils with an herb layer mostly constituted by the ecological groups of Deschampsia flexuosa, Vaccinium myrtillus, Pteridium aquilinum, Lonicera periclymenum, Holcus mollis, and of Maianthemum bifolium, Convallaria majalis, Hieracium sabaudum, Hypericum pulchrum, Luzula pilosa, and the mosses Polytrichum formosum and Leucobryum glaucum.
Forests of Q. robur and, sporadically Q. pyrenaica or hybrids, on podzols of southwestern France, with an herb layer constituted by the group of Deschampsia flexuosa, with Molinia caerulea and Peucedanum gallicum.