The outer wall (extine) of the pollen grain is often diagnostic (see pollen) and very resistant to decay.
粒外壁（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.
粒外壁（壁）通常为特异性的并很难腐烂。
A mass of waxy pollen grains transported as a unit in many members of the Orchidaceae and Asclepiadaceae.
块 Pollinium (pl. pollinia) 在许多兰科和萝藦科植
，
为传
位的蜡
粒团。
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