外壁层纹 [
wài bì céng wén]
exthecal lamella
- 花粉粒的壁由两层构成,外壁为孢粉素壁,具有很强的抵抗力,其上有特征性雕纹或孔纹。
Pollen grains are highly variable in size and shape ranging from 5μ to over 200μ in diameter and from circular to tetrahedral or dumbbell shaped.
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