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。
]粒外壁；孢子外壁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。
声
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