Floating, in part infra-aquatic, formations of Sphagnum spp., Scorpidium scorpioides, Utricularia spp., Campylium stellatum, Sparganium minimum and Sparganium natans of dystrophic bog pools, fen pools, heath pools and woodland ponds. Alliances are Sphagno-Utricularion and Scorpidio-Utricularion minoris.