22种假瘤蕨属植物孢子纹饰超微特征

利用扫描电镜对假瘤蕨属2系、5亚系22种植物的孢子纹饰特征进行了研究.结果显示:该属孢子为单裂缝、两侧对称,极面观为椭圆形,赤道面观为肾形.表面纹饰具有6种类型:光滑、粗糙、颗粒、棒状、疣状和瘤状纹饰以及它们之间的过渡类型.研究表明,孢子纹饰特征可以用来区分该属中的近缘种,但不能用以界定假瘤蕨属的属下分类--系和亚系.

Spore Ornamentation of 22 Species in the Fern Genus Phymatopteris Pichi-Serm.under SEM

The spore ornamentations of 22 species,representing 2 series and 5 subseries of the genus Phymatopteris,are examined by means of scanning electron microscopy (SEM).The spores are monolete,bilaterosymmetric,ellipsoidal in polar view,and kidney-shaped in equatorial view.Six main types:psilate,scabrate,granulate,baculate,verrucate,tuberculate and some transitional types are presented in spore surface ornamentation.The evidence from spore ornamentations can be used to differentiate the affined species in this genus.However,it can not be served as a criterion for distinguishing the subgeneric classification:series and subseries in Phymatopteris.