N the outermost coat of a pollen grain or a spore (花粉粒或孢子)外壁 [botany] → compare intine
Alveolae of the proximal exine are smaller and less regular in form than those at equatorial region.
近极区的穴较之赤道区的要小且形状较不规则。
Except for some differences in exine ornamentation and pollen size, there is no great evolutionary divergence among genera in pollen morphology.
总体来讲，花粉没有大的演化分异，只是表面纹饰和花粉大小有一定的差异。
Method: Pollen exine ultrastructure were compared for 18 populations growing under in the same environment by means of scanning electron microscope (SEM).
方法：借助扫描电镜对栽培在同一生境下的18个半夏居群的花粉形态、大小及表面纹饰等特征进行观测比较。
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