Morphological characteristics of Cystoseira s. l. taxa of the flora of Ukraine

The article presents the results of morphological and anatomical analysis Cystoseira sensu lato taxa in flora Ukraine, taking into account modern views on nomenclature genus. Earlier, based molecular phylogenetic analysis, it was shown that along Ukrainian shores polyphyletic genus s. l. is represented by three (Ericaria crinita f. bosphorica (Sauvageau) S.S.Sadogurska, J.Neiva et A.Israel., Gongolaria barbata (Stackhouse) Kuntze repens (A.D.Zinova & Kalugina) S.S.Sadogurska). As result present study, for these taxa, a set features vegetative generative organs analysed (general thallus appearance, structure apex branches, presence/absence appendages, aerocysts, shape size receptacles, iridescence, conceptacles, gametangia), as well an (cortex meristoderm cells cross section) carried out. showed have wide range variability, which makes their identification difficult. At same time, some characteristics are diagnostic allow reliably distinguish identify studied Based we provided description main c haracteristics proposed keys Ukraine. study macroalgae variability important further taxonomic studies, clarification identification.