Noun
That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; -- distinguished from phloem.
Source: Webster's dictionaryAdditional layers may be formed containing lignin in xylem cell walls, or containing suberin in cork cell walls. Source: Internet
Apart from the xylem and phloem in their vascular bundles, leaves are composed mainly of parenchyma cells. Source: Internet
Defunct tracheids were retained to form a strong, woody stem, produced in most instances by a secondary xylem. Source: Internet
Cowen reduced their price objective on shares of Xylem from $65.00 to $50.00 and set a “market perform” rating for the company in a research report on Thursday, May 7th. Source: Internet
By the formation of a layer of cambium between the bundles (interfascicular cambium), a complete ring is formed, and a regular periodical increase in thickness results from the development of xylem on the inside and phloem on the outside. Source: Internet
Development Patterns of xylem development: xylem in brown; arrows show direction of development from protoxylem to metaxylem. Source: Internet