Lenticel
Tissue that allows gas exchange in plant organs / From Wikipedia, the free encyclopedia
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A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of gymnosperms and dicotyledonous flowering plants.[2] It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases. The name lenticel, pronounced with an [s], derives from its lenticular (lens-like) shape.[3] The shape of lenticels is one of the characteristics used for tree identification.[4]