The outer wall (extine) of the pollen grain is often diagnostic (see pollen) and very resistant to decay.
花壁(花壁)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.
花壁(花壁)通常为特异性的并很难腐烂。
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