A description of Tabellaria stellata Kulikovskiy sp. nov. is given. This taxon has tripolar valves that were unknown in the genus Tabellaria Ehr. (Bacillariophyta). The tripolar shape of valves of T. stellata are similar to Fragilaria reicheltii (Voigt) Lange-Bert.
Keywords: Tabellaria stellata sp. nov., tripolar symmetry, Polistovo-Lowatsky sphagnum tract
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