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periderm
[ per-i-durm ]
noun
- Botany. the cork-producing tissue of stems together with the cork layers and other tissues derived from it.
- Embryology. epitrichium.
periderm
/ ˈpɛrɪˌdɜːm /
noun
- the outer corky protective layer of woody stems and roots, consisting of cork cambium, phelloderm and cork
periderm
/ pĕr′ĭ-dûrm′ /
- The outer, protective layers of tissue of woody roots and stems, consisting of the cork cambium and the tissues produced by it.
- See more at cork cambium
Derived Forms
- ˌperiˈdermal, adjective
Other Words From
- peri·dermal peri·dermic adjective
Word History and Origins
Word History and Origins
Origin of periderm1
Example Sentences
Yet lycopsid trunks were composed mostly of tissue called periderm, which corresponds to modern bark and contains little lignin.
It has been claimed for certain varieties of Wheat that increased thickness of the cuticle and fewer stomata per square unit of surface have diminished the risk of infection by Rust fungi, and for certain varieties of Potato, that the thicker periderm of the tuber protects them against fungi in the soil.
Rapid reproduction results in the majority of the young rootlets being thus attacked, and since they cannot form their normal periderm and harden off properly they rot, and admit fungi and other evils, in consequence of which the vine suffers also in the parts above ground.
Where the dry-rot is due to Fusarium the chalk-white stromata may often be detected breaking through the periderm; but it must be remembered that the soil-contaminated, broken skin of a potato-tuber is a favourable lurking spot for many fungi, and Periola, Acrostalagmus, and others have been detected therein.
Bark external to the first periderm layer, corresponding to the primary cortex.
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