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cambium
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cambium
The Columbia Encyclopedia, Sixth Edition
cambium , thin layer of generative tissue lying between the bark and the wood of a stem, most active in woody plants. The cambium produces new layers of phloem on the outside and of xylem ( wood ) on the inside, thus increasing the diameter of the stem . In herbaceous plants the cambium is almost inactive; in monocotyledonous plants it is usually absent. In regions where there are alternating seasons, each year's growth laid down by the cambium is discernible because of the contrast between the large wood elements produced in the spring and the smaller ones produced in the summer. These are the annual rings, by which the age of a tree can be established. A tree dies when it is "ringed," or girdled, i.e., cut through the cambium layer. The cork cambium, which lies outside the phloem layer, produces the cork cells of bark .
Author not available, CAMBIUM.,
The Columbia Encyclopedia, Sixth Edition 2008
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Related entries from encyclopedias, dictionaries, and thesauruses
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cambium
cambium (lateral meristem) A plant tissue consisting of actively dividing cells (see meristem ) that is responsible...of the plant, i.e. it causes secondary growth. The two most important cambia are the vascular (or fascicular) cambium and the cork cambium . The vascular cambium occurs in the stem ...
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cambium
cambium In botany, layer of cells parallel to the surface of stems and roots of plants. It divides to produce new cells that allow for growth in diameter of the stem and roots. There are two main types of cambium. Vascular cambium produces new phloem on the outside and xylem on the inside, leaving narrow ...
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cork cambium
cork cambium (phellogen) A type of cambium arising within the outer layers of the stems of woody plants...complete ring surrounding the inner tissues. The cells of the cork cambium divide to produce an outer corky tissue ( cork or phellem) and...
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vascular cambium
vascular cambium Cambium that produces secondary phloem on its outer side and secondary xylem on its inner side.
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fascicular cambium
fascicular cambium See cambium .
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