Lenticel
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A lenticel is a spongy area present in the cork surfaces of the stems, roots, and other parts of vascular plants. These structures allow for the exchange of gases between the internal tissues and atmosphere to occur across the periderm, which would otherwise prevent this exchange of gases.
[edit] Formation
Lenticel formation begins during the development of the first periderm. In the stem, they usually appear below a stoma or group of stomata. Lenticels are found as raised circular, oval, or elongated areas on stems and roots. As stems and roots mature lenticel development continues in the newly forming periderm found at the bottom of cracks in the bark. It should also be noted that lenticels can be present on fruits such as apples and pears.
[edit] References
- Raven, Peter H.; Ray F. Evert, Susan E. Eichorn (2005). Biology of Plants 7th Ed.. W.H. Freeman and Company Publishers, 586-587. ISBN 0-7167-1007-2.
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