This is an open vegetation type of serpentine outcrops with the serpentine specialist ferns Asplenium adulterinum and A. cuneifolium. It occurs in precipitation-rich submontane areas of the Bohemian Massif, where serpentine appears as an acidic rock due to cation leaching. This community is thus mainly composed of calcifuge species. Usually it is found on small outcrops in open pine forests.