Observation on the gametophyte development of {\sl Phymatosorus hainanensis} (Polypodiaceae)

Spore germination, gametophytic development and formation of young sporophytes of Phymatosorus hainanensis (Noot.) S. G. Lu have been observed in detail by the microscope. The result exhibits that the mature spore is yellowish,monolete, reniform in equatorial view and elliptical in polar view, with vary sizes global granules on it. The spores germinated in 6～8 days after inoculated in the medium, the germination is of the Vittaria type, and the germ filament developed 3～7cells long. The gametophyte development is of the Drynaria type, prothalli formed in 30 days after inoculated in the medium, while hairs developed after the formation of the prothallial plate. The young prothalli are short tongue shaped and the adult prothalli are cordate. The antheridia formed in 60 days after inoculation, while the archegonia developed in 70 days after inoculation. Each gametophyte can develop only one zygote. Vegetative propagation was often occurred on the basal part of the prothallial plate in the inorganic medium.