In woody plants, a layer of protective tissue that forms below the epidermis. It comprises dead cells, derived from the cork cambium (phellogen), and coated with a waxy substance (suberin) that renders them waterproof. Cork develops abundantly in the bark layer of certain plants, e.g. Quercus suber (cork oak), and is removed for commercial use. See also Quercus.
Subjects: Plant Sciences and Forestry.