: Paleoclimatología: exine

biological object > pollen > exine

exine

The exine is the outer wall of the pollen grain. Pollen grains have a double envelope: the inner layer (intine) is thin and mainly cellulosic, while the thicker outer layer is made up of sporopollenin and glycoproteins. The exine itself is double, consisting of extexine (or ectexine) on the outside and endexine on the inside. The exine may be smooth or ornamented, naked or covered with a fatty or mucilaginous coating. It has apertures (thinning areas, shaped like a pore or germinative furrow) that allow the grain to germinate, i.e. leave the pollen tube. This pollen polymorphism is linked to floral polymorphism and pollination methods. (Adapted and translated from: https://fr.wikipedia.org/wiki/Exine)

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