The morphological variability of diatoms of genus Kobayasiella: K. subtilissima (Cleve) Lange-Bertalot, K. parasubtilissima (H.Kobayasi et Nagumo) Lange-Bertalot and K. okadae Skvortsov) Lange-Bertalot from Lake Bolotnoe (northeastern European Russia) and Shichengskoe bog (Vologda Region) has been studied using scanning electron microscopy. Ranges of variability of the valve length and width as well as number of striae in 10 µm in K. subtilissima and K. parasubtilissima coincide with the published data. Differences were found in K. okadae according to these features: the length and width of a valve were larger and the number of striae in 10 µm was smaller compared to the literature data that may be due to interpopulation variability. For the first time patterns of variability of some quantitative features depending on the valve diameter have been revealed for the representatives of the genus Kobayasiella: the length/width ratio increases with the increase in its length. The different relationship is found between the number of striae in 10 µm and the valve length in K. subtilissima and K. parasubtilissima: the value of this feature decreases with the increase in the valve length. The assessment of the taxonomic value of these features according to the coefficient of variation shows their low variability (c_v= 3.9–10.3) that corresponds to the literature data on the other representatives of the genus Navicula s. l.

Keywords: Bacillariophyta, Kobayasiella subtilissima, K. parasubtilissima, K. okadae, electron microscopy, morphology, variability

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