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花粉粒外壁 [huā fěn lì wài bì]
extine
- 花粉粒外壁（花粉壁）通常为特异性的并很难腐烂。
The outer wall (extine) of the pollen grain is often diagnostic (see pollen) and very resistant to decay. - 它是花粉粒外壁向外扩展而形成的囊状结构，在花粉粒两侧呈翅状，其内充满空气。
It consists of an air-filled protuberance on each side of the pollen grain developed by the separation of the exine layers, giving the pollen a characteristic winged appearance. - 文摘:用扫描电镜对东北延胡索极其近缘植物的花粉形态进行了观察，结果发现花粉粒在形状、大小、外壁纹饰、沟的长短及宽度等方面均有区别，从中获得了东北延胡索及其近缘植物分类方面的孢粉学依据.因此花粉的特征可用于区别延胡索类植物.
Abstract: The pollen morphology of 5 species of Corydalis from northeast China was observed and compared by SEM.The results declared the shape and size of the pollen and exine sculpture of the 5 species were basically stable and could serve as a taxonomic character.
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