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层和内层，外层
括覆盖层、
和足层
三层，内层
一层。
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层和内层，外层括覆盖层、和足层三层，内层一层。
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