The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.
花粉壁的外壁
为外
和
，外包括覆盖、基粒棒和基足
三，只包含一。
The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.
花粉壁的外壁为外和，外包括覆盖、基粒棒和基足三，只包含一。
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