Glossary of "Plant Biology (1st ed.)" by Graham et al. (2003)
- A meristematic tissue that generates cork cells toward the periphery of a woody plant's stem or roots, and may also produce some parenchyma cells toward the inside; also known as phellogen.
Glossary of Plant Systematics (1st ed.) by Simpson (2006)
- A sheath or hollow cylinder of cells that develops near the periphery of the stem or root, undergoing tangential divisions to form phelloderm to the inside and cork to the outside.
- Graham, L. E., Graham, J. M. & Wilcox, L. W. 2003. Plant Biology. -xxxv + 497 pp. Pearson Education, Inc., Upper Saddle River.
- Simpson, M. G. 2006. Plant Systematics. -xi + 590 pp. Elsevier Academic Press, Oxford.