Chromosome number, karyotype and DNA C-value of the Wollemi Pine (Wollemia nobilis, Araucariaceae)

The Wollemi Pine (Wollemia nobilis, Araucariaceae) was discovered in 1994 in a remote area of the Wollemi National Park (New South Wales, Australia). With only around 40 adult trees known to be growing in the wild, it is one of the world's rarest plant species. The results of the first cytological study are reported, including a chromosome count (2n =2x=26), karyotype illustration and nuclear DNA C-value (4C=55.74 pg), obtained using Feulgen microdensitometry. The results are compared with data available on species in the other two genera of the Araucariaceae,Araucaria and Agathis, and with other gymnosperms.