U3-2 - Falaises continentales siliceuses des hautes montagnes des zones tempérées

Temperate high-mountain siliceous inland cliff

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Siliceous cliffs and rock faces of acidic, mostly Palaeozoic, rocks in the high mountains of the nemoral zone. Slow weathering of these resistant rocks creates few niches for colonisation, and the vascular flora of the crevices and on ledges is rather species-poor but rich in epilithic lichens.

Espèces diagnostiques

Androsace vandellii, Asplenium septentrionale, Primula latifolia, Jovibarba heuffelii, Silene lerchenfeldiana, Saxifraga pentadactylis, Draba dubia, Saxifraga pubescens, Veronica bachofenii, Primula hirsuta, Cardamine resedifolia, Phyteuma hemisphaericum, Dianthus henteri, Thymus comosus, Eritrichium nanum, Saxifraga geranioides, Galium tendae, Saxifraga retusa, Alchemilla saxatilis, Phyteuma humile

Espèces constantes

Asplenium septentrionale, Androsace vandellii, Phyteuma hemisphaericum, Cardamine resedifolia, Poa nemoralis, Draba dubia, Jovibarba heuffelii, Sedum brevifolium, Primula latifolia, Polypodium vulgare, Sempervivum arachnoideum, Saxifraga pentadactylis, Saxifraga paniculata, Saxifraga bryoides, Primula hirsuta, Asplenium trichomanes, Juncus trifidus, Cystopteris fragilis, Alchemilla saxatilis

Bibliographie

 European Topic Centre on Biological Diversity, 2021. EUNIS terrestrial habitat classification 2021 including crosswalks. ETC/BD-EEA. Table Excel transmise par S. Hennekens (Alterra) le 14/02/2022. (Source)