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
括覆盖、
棒和足
三，内只
。
(孢粉)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，外括覆盖、棒和足三，内只。
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