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Glossary of Plant Systematics (1st ed.) by Simpson (2006)

  • (a) A specialized, permanent opening in the upper epidermis of the thallus of some liverworts, functioning in gas exchange. (b) A single hole in the primary cell wall of sieve elements that is lined with callose and through which solutes flow in sugar conduction. (c) Vernacular term for a wood vessel, used in the wood industry.

Glossary of "The Evolution of Plants (2nd ed.)" by Willis & McElwain (2014)

  • A circular opening in the wall of pollen grains or all elliptical opening in the epidermis surrounded by two guard cells.


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