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The chromosome number of the genus Paphiopedilum was known to be highly variable: 2n=26, 28, 30, 32, 34, 36, 38, 40, 42 (Mehlquist 1947, Duncan 1947, Duncan and MacLeod 1948, 1949, 1950, Kamemoto et al. 1963, Tanaka 1964, 1965, Sasa and Torigata 1967, Tanaka and Aoyama 1974). According to these papers the species with 2n=26 chromosomes had only median chromosomes, while the species with 2n=30 or more chromosomes had some terminal chromosomes in addition to median chromosomes. It was proposed that the terminal chromosomes were the derivatives of the median chromosomes by centric fission (Duncan and MacLeod 1949, 1950, Kamemoto et al. 1963, Tanaka and Aoyama 1974). In the present investigation, the karyotypical change was studied by C-banding analysis in two species of Paphiopedilum.

C-banding study on centric fission in the chromosome of Paphiopedilum.