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The exodermis (composed of the Greek words; Greek exo outside, dermis from derma: skin, dermis) is the secondary tissue of the root . It is formed from the hypodermis , corks and replaces the rhizodermis , the root hairs of which have a limited lifespan. The cells of the rhizodermis die with the hair, and the exodermis, which is often already equipped with the first suberin wall lamellas, takes over the function of the closing tissue. This is where the zone of root branching begins.