This vegetation type, dominated by Chara hispida, occurs in small unmanaged or less intensively managed fishponds and flooded sand or loam pits. It has also been documented from a natural habitat of pools within a calcareous fen complex near Lysá nad Labem. It grows in water with a higher concentration of calcium than typical of other stonewort associations. This association has been so far recorded at a few sites in warm lowlands of northern and central Bohemia.