If new cork cambia arise every few years, as in most species of woody plants, then the bark includes dead phloem and cortex as well as cork, and is termed rhytidome.

• 若新的木栓形成层年年都有所加厚，像在多数的木本植物中，树皮就包括死去的韧皮部，皮层以及木栓（软木），这些部分共同构成落皮层。