This association includes wet meadows on acidic, base-poor soils, which are common on the siliceous bedrocks at medium and higher altitudes of the Bohemian Massif. They are absent from lowlands and the flysch-dominated regions of the Carpathians. Persistent water-logging supports development of a rich moss layer and impedes biomass decomposition, resulting in formation of a shallow peat layer covering the soil surface. These meadows are often spatially and successionally linked to fens.