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| Young Aristolochia
Stem The Cork Cambium in Aristolochia also produces cells towards the inside of the stem. These are called Phelloderm & they resemble typical Parenchyma. They do not produce Suberin and they remain alive at maturity |
 
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| Older Aristolochia Stem The Cork Cambium becomes hyperactive is certain locations. This disrupts the surface and can produce cells which are loosely interconnected and contain less suberin that typical cork cells. These areas are called Lenticils. It is thought that these provide a path for gas exchange across the otherwise impermeable Periderm. |
 Also note the disruption of the extraxylary fibers in the Cortex. These gaps are filled with Parenchyma. Also note the extremely wide Interfascicular Parenchymatous Rays. |
