Abstract
Molecular data from isozyme analyses were used to characterize levels and patterns of genetic diversity in populations of the neotropical cheilanthoid fern Hemionitis palmata. All populations exhibited lower levels of genetic diversity than most other fern species previously studied. Variability in fixation indices and estimated intragametophytic selfing rates suggest that the predominant mating system varies from outcrossing to moderate levels of selfing among populations. Populations were significantly genetically differentiated from each other and estimated levels of interpopulation gene flow were generally low (i.e. Nm < 1.0). The wide geographical distribution of H. palmata may be accounted for by the ability of founding individuals to inbreed. Such an ability, along with founder effects, may explain the observed high levels of genetic differentiation among populations.
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