One of the mysteries of the English language finally explained.
The decay-resistant outer coating of a pollen grain or spore. It typically bears a highly characteristic surface pattern that is used in palynology.
- ‘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.’
- ‘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.’
Late 19th century: perhaps from ex- ‘out’ + Greek is, in- ‘fiber’.
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