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== Definition ==
== Definition ==
=== Glossary of Plant Systematics (1st ed.) by [[Simpson_2006|Simpson (2006)]] ===
* The hard, outermost, desiccation-resistant layer of a pollen grain wall, providing structural support and inhibiting desiccation.
=== Glossary of "Evolution of Plants (2nd ed.)" by [[Willis_McElwain_2014|Willis & McElwain (2014)]] ===
=== Glossary of "Evolution of Plants (2nd ed.)" by [[Willis_McElwain_2014|Willis & McElwain (2014)]] ===
* Outer part of the wall of a pollen grain composed of the resistant [[biopolymer]] [[sporopollenin]].
* Outer part of the wall of a pollen grain composed of the resistant [[biopolymer]] [[sporopollenin]].
