Ultrastructure of the Mature Egg and Fertilization in the Fern Ceratopteris thalictroides Immunofluorescence Localization of Centrin and Tubulin during Spermatogenesis of Ceratopteris thalictroides Primary Study on Antheridiogen System of Dryopteris uniformis Effects of Light Intensity on Spore Germination and Sex Differentiation of Ceratopteris thalictroides(L.) Brongn. Effect of Culture Medium and Spore Dimension on Spore Germination and Sex Differentiation of Ceratopteris thalictroides (L.) Brongn. Effects of Pb2+ on Spore Germination and Gametophyte Development of Three Species of Fern SPORE MORPHOLOGY OF CERATOPTERIS BRONGN. AND TAXONOMIC STATUE Gametophyte Development of Pteris biaurita and Effects of Its Antheridiogen on the Gametophyte Development of Ceratopteris thalictroides Chlorophyll Fluorescence Analysis of Hermaphrodite and Male Gametophytes from Ceratopteris thalictroides(L.) Brongn. on Different Media Formation and Development of Archegonium in the Fern Ceratopteris thalictroides(L.)Brongn Molecular clone and sequence analysis of hemoglobin gene in Ceratopteris thalictroides Studies on the development of gametophyte of Ceratopteris thalictroides Isolation and Expression Profiling of Gene Encoding Chalcone Synthase in Ceratopteris thalictroides Effects of Herbicide Quinclorac on Sexual Reproduction of Ceratopteris pteridoides