The intine (I) of aperture in fertile pollen grains was opened with conspicuous three strata.Sterile pollen grains display a thickness intine and exine in the aperture which was not opened.

• 雄花花粉于孔区之花粉外壁破裂且花粉内壁具明显三层，但两性花所产生的不孕性花粉之孔区的内壁较厚且外壁通常不破裂。