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Materials on phytoplankton from 11 Karelian lakes located in the basins of the White and Baltic seas were studied by scanning electron microscopy; 22 representatives of diatom algae of the class Centrophyceae, including those that are new for the flora of the lakes (Aulacoseira lacustris, A. perglabra, A. tenella, A. valida, Discostella cf. pseudostelligera, S. invisitatus) and new for Karelia (Brevisira arentii, Stephanodiscus delicatus), have been recorded. A revision of the species composition of Centrophyceae in the waterbodies of Karelia has been made. Diagnoses and the systematic status of some species, varieties, and forms have been specified. A new list includes 51 taxa from 12 genera: Acanthoceras (1), Aulacoseira (23), Brevisira (1), Cyclostephanos (1), Cyclotella (7), Discostella (2), Ellerbeckia (2), Melosira (2), Puncticulata (1), Rhizosolenia (3), Stephanodiscus (7), and Thalassiosira (1).
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Генкал et al. (2011) studied this question.
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