What is the difference between the epidermis and the periderm in the cross-section of aristolochia?

In the cross-section of Aristolochia, the epidermis is the outermost layer of cells that serves as a protective barrier, preventing water loss and providing mechanical support. In contrast, the periderm is a secondary protective tissue that replaces the epidermis in stems and roots during secondary growth, primarily consisting of cork cambium, cork, and phelloderm. While the epidermis is typically single-layered and composed of living cells, the periderm is multilayered and contains dead cells that contribute to its protective function.