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Lenticel

From Biology-Online Dictionary
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Lenticel

a loosely-packed mass of cells in the bark of a woody plant, visible on the surface of a stem as a raised powdery spot, through which gaseous exchange occurs. One of many raised pores on the stems of woody plants that allow the interchange of gas between the atmosphere and the interior tissue.A small pore found near stomata in plants that allows gaseous exchange to occur between the internal and external environments of the plant.