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Abstract
Four new diatom species (Fragilaria incognita, Navicula exiliformis, Navicula mediocostata, Navicula subalpina) are described from Upper Bavarian and Northern Tyrolian alpine or subalpine lakes using light and scanning electron microscopy. Variability within each and the characters distinguishing them from related taxa are discussed, and the distribution of the new taxa within the quoted area is given.