Noun
That portion of fibrovascular bundles which corresponds to the inner bark; the liber tissue; -- distinguished from xylem.
Source: Webster's dictionaryApart from the xylem and phloem in their vascular bundles, leaves are composed mainly of parenchyma cells. Source: Internet
Diagram illustrating how Cuscuta uses haustoria to penetrate the vascular system of its host plant and remove sugars and nutrients from the host's phloem. Source: Internet
As a result, tissues beyond the secondary phloem including the epidermis and cortex, in many cases tend to be pushed outward and are eventually "sloughed off" (shed). 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
Exceptions include highly lignified cells, the sclerenchyma and xylem which are dead at maturity, and the phloem sieve tubes which lack nuclei. Source: Internet
In plants with secondary growth, the vascular cambium, originating between the xylem and the phloem, forms a cylinder of tissue along the stem and root. Source: Internet