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

The Wollemi Pine (Wollemia nobilis, Araucariaceae) was discovered in 1994 i n 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 s tudy are reported, including a chromosome count (2n=2x=26), karyotype illus tration and nuclear DNA C-value (4C=55.74 pg), obtained using Feulgen micro densitometry. The results are compared with data available on species in th e other two genera of the Araucariaceae, Araucaria and Agathis, and with ot her gymnosperms. (C) 2001 The Linnean Society of London.