Vegetation Science Group

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

Vegetation of the Czech Republic

Association VAA09
Lemno minoris-Riccietum fluitantis Šumberová et Chytrý in Chytrý 2011

Lemno minoris-Riccietum fluitantis

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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.

Syn.: Riccietum fluitantis sensu auct. non Slavnić 1956 (pseudonym)

Diagnostic species: Lemna minor, Riccia fluitans, Ricciocarpos natans. Utricularia australis

Constant species: Lemna minor, Riccia fluitans

Dominant species: Lemna minor, L. trisulca, Riccia fluitans

Formal definition: Riccia fluitans cover > 25 % NOT Group Ranunculus sceleratus NOT Alopecurus aequalis cover > 25 % NOT Carex acuta cover > 25 % NOT Carex vesicaria cover > 25 % NOT Glyceria fluitans cover > 25 % NOT Glyceria maxima cover > 25 % NOT Juncus effusus cover > 25 % NOT Nymphoides peltata cover > 25 % NOT Potamogeton acutifolius cover > 25 % NOT Potamogeton natans cover > 25 % NOT Ricciocarpos natans cover > 25 % NOT Salvinia natans cover > 5 % NOT Scirpus sylvaticus cover > 25 % NOT Sparganium emersum cover > 25 % NOT Sparganium erectum cover > 25 % NOT Typha latifolia cover > 25 % NOT Utricularia australis cover > 25 %

Source: Šumberová K. (2011): VAA09 Lemno minoris-Riccietum fluitantis Šumberová et Chytrý in Chytrý 2011. 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. 69-72.