中文摘要：

利用光镜、扫描电镜和透射电镜对水龙骨科（Polypodiaceae）瓦韦（Lepisorus thunbergianus（Kaulf．）Ching）孢子壁的结构和发育进行了研究。研究结果表明瓦韦孢子两侧对称、单裂缝，表面具波纹状纹饰。孢壁从内到外由内壁、外壁和周壁三部分构成。外壁来源于绒毡层物质，由外壁内层和外壁外层构成，外壁外层表面的波纹状纹饰形成孢子表面的纹饰轮廓。周壁薄，紧贴外壁表面，由2层片状结构叠合而成。在外壁外层形成过程中，孢子表面和周围出现较多小球。本文探讨了孢壁各层的结构、来源和发育过程，为蕨类植物系统学和孢粉学研究积累资料。

英文摘要：

The structure and development of sporoderm of the fern Lepisorus thunbergianus （ Kaulf. ） Ching（Polypodiaceae） are studied by means of light microcope （LM）, scanning electron microscope （SEM） and transmission electron microscope （TEM）. The results as follow ： the mature spores of Lepisorus thunbergianus （Kaulf.） Ching are bilateral and monolete and show an undulate ornamentation. The sporoderm consists of endospore, exospore and perispore from the inside to the outside. The exospore is derived from the tapetal materials. It is composed of two layers, i.e. the outer layer and inner layer of exospore. The undulate ornamentation in the surface of outer layer of exospore forms the outline of ornamentation. The perispore is very thin and adhere closely to the exospore surface. It is formed by two layers of lamellae. Many glubules appear on the surface of spore in the stage of exspore formation. In the present paper the structure, origin and development of the spore wall are discussed. The results will provide basic information for the palynology and phylogeny of ferns.