This vegetation type is dominated by Riccia fluitans, a submerged liverwort, which occurs in oligo-mesotrophic to naturally eutrophic water bodies. It is often accompanied by other species requiring clear water, such as Lemna trisulca and Utricularia australis. The association occurs in small ponds and abandoned, flooded sand pits or stone quarries. In the past it also occurred in alluvial pools and oxbows, but it became rare in such habitats due to eutrophication. This vegetation has scattered localities across the Czech Republic, and it is currently more common at mid-altitudes, where more water bodies with clean water have been preserved.