Abstract:The pteridophyte flora of Guangdong consists of 56 families, 139 genera and 464 species, among them primitive taxa or relic species are abundant. A detailed floristic analysis shows: ① The pteridophyte flora of Guangdons has 3 monotypic familiar, 9 monotypic genera and 4 woody genera. ② The tropical and subtropical families are dominant, which constitute 39. 3% of the total families, and the pantropic, the cosmopolitan and the temperate families being 33. 9%, 21. 4%, and 7. 1%, respectively. ③ The percentages of cosmopolitan, Pantropic, tropic-subtropic, subtropic and temperate genera in fern flora of Guangdong are 6. 5%, 29. 5%, 29. 5%, 25. 9 % and 8. 6%, respectively. Most genera are monotypic and oligotypic (77%). The above distribution pattern reveals the transitiveness of the elements from tropical to subtropical. ④ The pteridophyte flora of Guangdong is closely related to that of Guangxi (esp. in SE Guangxi), the index of genus similarity being 0. 84. and is also related to that of Hainan, S Hunan, Fujian and S Jiangxi, Showing an integrality of pteridophyte flora of S China.
