Vegetation Science Group

Department of Botany and Zoology | Faculty of Science | Masaryk University

Vegetation of the Czech Republic

Class VA
Lemnetea de Bolós et Masclans 1955
Vegetation of free floating aquatic plants

VAA Lemnion minoris

VAB Utricularion vulgaris

VAC Hydrocharition morsus-ranae

The class Lemnetea includes species-poor aquatic vegetation of free-floating macrophytes, which are not rooted in the bottom. They can be either natant (floating on the water surface) or submerged. Natant species include small lemnids, aquatic ferns and liverworts, but there are also large floating species such as Hydrocharis morsus-ranae and Stratiotes aloides. Submerged floating macrophytes include Lemna trisulca, species of Ceratophyllum, Utricularia and liverworts. This vegetation occurs in eutrophic to mesotrophic water bodies. It is widespread all over the world including the tropics. In the Czech Republic it is common, especially at low to middle altitudes.

Orig. (de Bolós & Masclans 1955): Lemnetea

Syn.: Lemnetea minoris Tüxen 1955 (§ 2b, nomen nudum)

Diagnostic species: Ceratophyllum demersum. Lemna gibba, L. minor, L. trisulca. Spirodela polyrhiza

Constant species: Lemna minor, Spirodela polyrhiza

Source: ©umberová K. (2011): VA Lemnetea de Bolós et Masclans 1955. In: Chytrý M. (ed.), Vegetace České republiky. 3. Vodní a mokřadní vegetace [Vegetation of the Czech Republic 3. Aquatic and wetland vegetation]. Academia, Praha, pp. 43-46.