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The decay-resistant outer coating of a pollen grain or spore.
- ‘Short elongated elements occur on the orbicule wall, similar to those present on the pollen exine.’
- ‘The final activity of these cells is to deposit their remaining cell contents onto the developing pollen exine, with the only remaining identifiable organelles at this stage being the mitochondria.’
- ‘Orbicules may be attached to the exine of the pollen grains.’
- ‘A few grains were seen which had shed the exine and released a circular microgametophyte, although the actual process was not observed.’
- ‘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.’
Late 19th century: perhaps from ex- ‘out’ + Greek is, in- ‘fibre’.
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