Clypeate grains are either functionally omniaperturate and have a thin exine and uniformly thickened intine or are porate with localized thickenings of intine. |
Pollen grains possessing a much-reduced exine and elaborated intine are known to occur in 54 families of angiosperms and are nearly ubiquitous in Zingiberales. |
Exine and Intine are formed in this stage and tapetum in this plant is plasmodial type. |