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Cytogenetical studies on interspecific Fl hybrids between Brassica campestris and B. oleracea were carried out. Hybrid plants were produced by the culture in vitro of excised ovaries. Three types of Fl hybrids were obtained in the cross between diploid B, campestris, and diploid and autotetraploid B. oleracea. The first type plants had 19 chromosomes in root tip cells. The second type plants had 38 chromosomes which were presumably raised by spontaneous chromosome doubling during embryodoi:10.1266/jjg.55.189 fatcat:vtnq5lrtkvelnjo5zmm2g2odcm