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
外分为外层和内层，外层包括覆盖层、基粒棒和基足层
三层，内层只包含一层。
)The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.
花外分为外层和内层，外层包括覆盖层、基粒棒和基足层三层，内层只包含一层。
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