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The phylogenetic relationships between Baikalian endemic green alga Draparnaldioides simplex C. Meyer et Skabitch., 1976 and holarctic taxa of green algae have been studied using the 18S rDNA gene fragment and internal transcribed ITS1 and ITS2 spacers of nuclear DNA. The Baikalian genus Draparnaldioides was shown to be a separate taxon. The level of genetic difference between the studied species and non-Baikalian taxa of sister groups of green algae is insignificant, which indicates the young age of the genus Draparnaldioides and its recent radiation from the common ancestor with genera Draparnaldia and Chaetophora. [ABSTRACT FROM AUTHOR]