SynopsisResults are presented of a cytological survey of the Pteridophyte flora of Jamaica. Approximately 270 species or cytotypes were investigated, only a few of which have previously been investigated from other parts of the world. Several genera have been cytologically examined for the first time and their phylogeny has been discussed in the light of these findings. A number of species complexes and interspecific hybrids have been revealed. The overall statistics of the survey are compared with those compiled from an investigation of the Pteridophyte flora of Ceylon, by Manton and Sledge (1954). Finally, endemic species are discussed in the light of the cytological results and the time known to have been available for their establishment in Jamaica.
SynopsisThe Braithwaite system of agamospory is reviewed. The few ferns having this system are very diverse, both systematically and in their behaviour. It is concluded that this type of agamospory has arisen independently several times by different routes.
SynopsisCytological results are presented for 60 taxa of Jamaican ferns which supplement information obtained from an earlier survey (Walker 1966). A number of hybrids which form local populations and which may be mistaken for fertile species are described and illustrated. Some species complexes are examined and shown to be more extensive than previously thought. The results presented here are examined in the light of the findings of the earlier survey.
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