Abstract
Applying mating system genetics as the tool, three tropical ferns, namely, Ceratopteris thalictroides, Pseudodrynaria coronans and Pityrogramma calomelanos were examined for their distributional patterns. Absence of recessive lethals in the sporophytes of P. calomelanos allows its spores to function as a single propagule in the colonization of open habitats through intra-gametophytic selfing and it is widely distributed. The phenomenon of leaky lethality and ultimately recessive sporophytic lethality in P. coronans is associated with a restricted distribution of the species in the forest. Ecological specialization in the case of C. thalictroides also renders it a poor colonizer though its mating system is directed towards intergametophytic selfing with capacity in time for intra-gametophytic selfing.
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