The exine is composed of tectum, columellae, foot layer and endexine.

由顶盖、柱状、底及所组成。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

的分为和，包括覆盖、基粒棒和基足等三，只包含一。

The exine is composed of tectum, columellae, foot layer and endexine.

花粉外由顶盖、、底及外内所组成。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花粉的外分为外内，外包括覆盖、粒足等三，内只包含一。

The exine is composed of tectum, columellae, foot layer and endexine.

花粉外由、柱状、底及外内所组成。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花粉的外分为外和内，外包括覆、粒棒和等三，内只包含一。

The exine is composed of tectum, columellae, foot layer and endexine.

花粉由顶盖、柱状、底及所组成。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花粉的分为和，括覆盖、基粒棒和基足等三，只含一。

The exine is composed of tectum, columellae, foot layer and endexine.

花由顶盖、柱状、底及内所组成。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花分和内，包括覆盖、基粒棒和基足等三，内只包含一。

The exine is composed of tectum, columellae, foot layer and endexine.

花粉外由顶盖层、柱状层、底层及外内层所组成。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花粉的外分为外层和内层，外层包括覆盖层、基粒棒和基足层等三层，内层只包含一层。

The exine is composed of tectum, columellae, foot layer and endexine.

花粉外由顶盖、柱状、底及外内所组成。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花粉的外分为外和内，外包括覆盖、基粒棒和基足等三，内只包含。

The exine is composed of tectum, columellae, foot layer and endexine.

粉外由顶盖、柱状、底及外内所组成。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

粉的外分为外和内，外括覆盖、基粒棒和基足等三，内含一。

The exine is composed of tectum, columellae, foot layer and endexine.

花由顶盖、柱状、底及所组成。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花的分为和，包括覆盖、基粒棒和基足等，只包含一。