摘要
利用扫描电镜对国产凤尾蕨科(Pteridaceae)2属30种4变种植物孢子进行了观察.其中凤尾蕨属(Pteris)29种4变种,孢子三裂缝,辐射对称;极面观为钝三角形,赤道面观为半圆形或超半圆形;孢子极轴长26～54 μm,赤道轴长34～97 μm;外壁厚,形成孢子表面纹饰的轮廓;周壁薄,紧贴于外壁上;多数种类孢子外壁具沿赤道加厚的赤道环,孢子表面呈瘤块状、疣块状,或隆起的脊连成网状或拟网状等纹饰,有的种类具近极脊和远极脊.凤尾蕨属植物孢子的形态稳定,种间差异明显,但孢子形态特征与孢子体的形态特征是不相关的.栗蕨属(Histiopteris)植物孢子为单裂缝,两侧对称,极面观椭圆形,赤道面观豆形;孢子极轴长22～23 μm,赤道轴长29～36 μm;周壁很薄,由外壁形成孢子纹饰的轮廓;表面呈粗的块状纹饰.从孢子形态上看,栗蕨属与凤尾蕨属有很大差异,将其放在一个科中不合适.
The spore morphology of 30 species 4 variety of 2 genera of Pteridaceae from China was investigated under seanning electron microscope （SEM）. Among them, 29 species 4 variety belong to the genus Pteris. The spores of Pteris are trilete, radiosymmetrical, subtriangular in polar view and hemispherical or subhemispherical in equatorial view. The polar axes are 26-54μm long, and equatorial axes are 34- 97μm long. The perispore is thin and the surface ornamentation is formed by the exospore. The types of ornamentation are tuberculiform-rugulate, verruciform-rugulale or lophate, the spore of most species with the equatoial flange, some species with proximal ridge and distal ridge. The spore morphology of Pteris is stable, and the difference between species is distinct, but the features of spore and sporophyte are not related. The spore of Histiopteris is monolete and bilaterally symmetrical, elliptical in polar view and kidney-shaped in equatorial view. The polar axes are 22-23μm long, and equatorial axes are 29-36μm long. The perispore is thin and the surface ornamentation is formed by the exospore. The surface is rugulate. The spore morphology of Histiopteris and Pter is very differential, put genus Histiopteris in family Pteridaceae is not suitable, according to the feature of spore morphology.
出处
《云南植物研究》
CSCD
北大核心
2005年第5期489-500,共12页
Acta Botanica Yunnanica
基金
国家自然科学基金(No.30270088
C39470067)
