Spring communities of waters poor in lime dominated by bryophytes, mostly characteristic of northern upland and high montane, alpine or subalpine levels, also locally of well-lit lowland sites. The principal mosses that compose them are Philonotis fontana, P.seriata, Anthelia julacea, Pohlia wahlenbergii, Scapania paludosa, Bryum schleicheri, Sphagnum auriculatum. A few small vascular plants accompany them, in particular Montia fontana, Saxifraga stellaris, S. rivularis, S. aquatica, Cerastium cerastoides, Epilobium anagallidifolium.