This vegetation type is dominated by Potamogeton trichoides, a submerged aquatic macrophyte, which occurs in mesotrophic to slightly eutrophic, calcium-rich, clear water, particularly in small fishponds, and less frequently in alluvial pools, oxbows, flooded sand pits and slow-moving water. Its localities are scattered in lowlands and colline landscapes across the Czech Republic. The occurrence of P. trichoides in individual localities is often ephemeral, and in recent decades this species has slightly decreased because of eutrophication.