Navicula integra (Bacillariophyceae) in Bohemia

The occurrence of Navicula integra (Bacillariophyceae), a diatom of salt waters, in the basin of the Lužnice river (South Bohemia, Czech Republic) is reported. The ecology of the species is characterized and its former findings in Europe are reviewed. The ecological conditions at one of the localities in which the species was found do not correspond completely to the knowledge of the species' autecology. It is concluded that the ecological amplitude of Navicula integra could be wider than inferred from available data.