]> 'Sergey' or 'Sergei' are Russian and 'Sergii' is Ukrainian. [author note: M. H. Kholodny Inst. Bot., Kiev; Lichens] Botany Kondratyuk, Sergei Yakovlevich Kondratyuk, Sergei Yakovlevich S. Y. Kondr. S. Y. Kondratyuk Kondratiuk, Sergii Kondratjuk, Sergey Sergei Yakovlevich Kondratyuk