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
壁分为
和内，
括覆盖、基粒棒和基足
三，内只含一。
(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.
花粉壁的壁分为和内，括覆盖、基粒棒和基足三，内只含一。
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