Monosomic analysis was carried out to determine the chromosomal locations of the fertility-restoring genes of Triticum compactum cv. No. 44 against the Aegilops caudata cytoplasm, and those of T. aestivum cv. Chinese Spring against the Ae. umbellulata cytoplasm. T. compactum cv. No. 44 carried two duplicated restoring genes, Rfc₂ and Rfc₃ on its chromosomes, 6B and 1D, respectively. T. aestivum cv. Chinese Spring carried two complementary genes, Rfu₁ and Rfu₂ on its chromosomes, 1B and 2B, respectively. A review of the literature, together with the present results revealed that all the satellited chromosomes so far tested carry some restoring genes. Additional evidence from the study of T. aestivum strain Salmon suggested that the restoring genes are located in the nucleolus organizer region of the respective chromosomes. The restoring genes on the four homoeologous chromosomes of group 1 are also assumed to be homoeologous.