Orig. (Jeník 1961): Cetrario-Festucetum supinae as. nova (Cetraria cucullata, C. islandica, C. nivalis)
Syn.: Carici rigidae-Festucetum airoidis (Jeník 1961) W. Matuszkiewicz 1965 (fantom), Festuco supinae-Polytrichetum piliferi Jeník et al. 1980
Formal definition: (group Festuca supina OR group Thamnolia vermicularis) NOT Calluna vulgaris cover > 25 % NOT Empetrum nigrum s. l. cover > 25 % NOT Molinia caerulea s. l. cover > 25 % NOT Nardus stricta cover > 25 % NOT Vaccinium myrtillus cover > 25 %