分析了黑松、马尾松及其杂种的核型。其核型公式：黑松为Ｋ(２ｎ)＝２４＝２０ｍ(６_ＳＡＴ)＋４ｓｍ；杂种为Ｋ（２ｎ）＝２４＝２３ｍ＋１ｓｍ；马尾松为Ｋ（２ｎ）＝２４－２４ｍ（４_ＳＡＴ）。相对长度和臂比方差分析表明，两亲本和杂种差异显著。杂种在相对长度、全组染色体总长、最长与最短染色体比、臂比平均值以及染色体类型上均处于双亲之间。这些研究结果为进一步研究该天然杂种提供必要的细胞学资料。

 The karyotype analyses of Pinus thunbergii Parl., P. masscmiana Lamb. and their hybrid indicated that their karyotypic formulas were K(2n) = 24= 20m(6_SAT) +4sm, K(2n) = 24 = 24m (4_SAT) and K (2n) = 24 = 23m +1sm seperately. The results of variance analysis showed that the differences of karyotypes among three species were significant. The relative length, mean arm ratios, total length of the genome, largest/ smallest and chromosomes types in the hybrid were two parents intermediary. These results will provide cytological data to the study of Pinus .