Paper deals with critical analysis of the representatives of genus Phormidium Kütz. ex Gomont (Oscillatoriales, Cyanoprokaryota) in Ukrainian flora, their ecology and distribution. New nomenclatural combinations are proposed: Phormidium anissimovae (Elenkin) O.M. Vynogr. comb. nov., Ph. kondratjevi (N.V. Kondrat.) O.M. Vynogr. comb. nov., Ph. takyricum (Novichk.) O.M. Vynogr. comb. nov.
Keywords: Phormidium, Oscillatoriales, Cyanoprokaryota, new taxonomic combinations, flora, Ukraine
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