Cork cambium (pl. cambia or cambiums) is a tissue
found in many vascular plants as a part of the epidermis
. It is one of the many layers of bark
, between the cork and primary phloem
. The cork cambium is a lateral meristem
and is responsible for secondary growth that replaces the epidermis
s and stem
s. It is found in woody and many herbaceous dicot
s and some monocot
s (monocots usually lack secondary growth). It is one of the plant's meristems – the series of tissues consisting of embryonic disk (incompletely differentiated) cells from which the plant grows. The function of cork cambium is to produce the cork
, a tough protective material.
[Junikka, L. (1994) "Macroscopic bark terminology". ''IAWA Journal'' 15(1): 3–45] [Trockenbrodt, M. (1990) "Survey and discussion of the terminology used in bark anatomy". ''IAWA Bulletin, New Series'' 11: 141–166]
Synonyms for cork cambium are bark cambium, pericambium and phellogen. Phellogen is defined as the meristematic cell layer responsible for the development of the periderm. Cells that grow inwards from there are termed ''phelloderm'', and cells that develop outwards are termed ''phellem'' or cork (note similarity with vascular cambium
). The periderm
thus consists of three different layers:
* phelloderm – inside of cork cambium; composed of living parenchyma cells
* phellogen (cork cambium) – meristem that gives rise to periderm
* phellem (cork) – dead at maturity; air-filled protective tissue on the outside
Growth and development of cork cambium is very variable between different species, and is also highly dependent on age and growth conditions, as can be observed from the different surfaces of bark, which may be smooth, fissured, tesselated, scaly, or flaking off.
Commercial cork is derived from the bark of the cork oak ''(Quercus suber).'' Cork has many uses including wine bottle stoppers, bulletin boards, coasters, hot pads to protect tables from hot pans, insulation, sealing for lids, flooring, gaskets for engines, fishing bobbers, handles for fishing rods and tennis rackets, etc. It is also a high strength-to-weight/cost ablative material for aerodynamic prototypes in wind tunnels, as well as satellite launch vehicle payload fairings, reentry surfaces, and compression joints in thrust-vectored solid rocket motor nozzles.
Many types of bark are used as mulch.
* Frost crack
* Sun scald (flora)