V originále
The species Hamatocaulis vernicosus is a fen moss, which is endangered and protected in Europe. Recently we have known 9 localities of this species in the Bohemian Forest. Vegetation relevés and detailed water chemistry were investigated at all localities and subsequently compared with data on H. vernicosus from different parts of the Czech Republic. The studied species grows in similar vegetation types in all of the Czech localities, including the Bohemian Forest. However, in the Bohemian Forest sites, chemical composition of water differs markedly, particularly in Ca, Mg and NO3 contents.