Hybrid plants were produced by the culture in vitro of excised ovaries. Three types of F1 hybrids were obtained in the cross between diploid B. campestris, and diploid and autotetraploid B. oleracea. The 1st type plants had 19 chromosomes in root tip cells. The 2nd type plants had 38 chromosomes which were presumably raised by spontaneous chromosome doubling during embryo development. The 3rd type plant had 28 chromosomes which were produced by the cross, diploid B. campestris .cntdot. autotetraploid B. oleracea. Mode of the chromosome configurations at the 1st meiotic division of the 1st type hybrids was 9II + 1I (44.7%). Frequency of tri-, tetra- and pentavalents was 38.6, 10.3 and 1.3%, respectively. Tetra- and pentavalents were observed for the 1st time in the present experiment. Chromosome configurations at meiosis of the 2nd type hybrids were mostly 19II (86.7% and 80.0% in 2 plants). The mode of chromosome configurations at meiosis of the 3rd type hybrids was 9II + 10I (40.9%). Frequency of tri- and tetravalents was 38.1% and 1.2%, respectively. Tetravalents were observed for the 1st time.