Comparative Gametophyte Morphology of Selected Species of the Family Polypodiaceae

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Abstract
Gametophyte morphology and growth habit of seven epiphytic species of six genera in the Polypodiaceae are described. In addition to the Drynaria-type of early development, depicted previously in most of this family and expressed in all species observed, the Ceratopteris-type, Adiantum-type, and Aspidium-type also occurred in some of the species observed. All species observed were long-lived, clone-forming, and without gemmae. The long-lived, clone-forming habit increases the space and time occupied by gametophytes, and thus enhances the probability of interaction with other gametophytes and the probability of intergametophytic mating in epiphytic habitats.

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