exine
/ˈɛksɪn
/ /ˈɛksʌɪn/noun Botany
The decay-resistant outer coating of a pollen grain or spore.Orbicules may be attached to the exine of the pollen grains....
- Short elongated elements occur on the orbicule wall, similar to those present on the pollen exine.
- This study concentrates on these parameters using purified exines (sporopollenin capsules) prepared from pine pollen, which consist of a central capsule and two lateral sacci.
Origin
Late 19th century: perhaps from ex-2 'out' + Greek is, in- 'fibre'.