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