periderm

American  

[per-i-durm] / ˈpɛr ɪˌdɜrm /

noun

1. Botany.  the cork-producing tissue of stems together with the cork layers and other tissues derived from it.

2. Embryology.  epitrichium.

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periderm British  

/ ˈpɛrɪˌdɜːm /

noun

1. the outer corky protective layer of woody stems and roots, consisting of cork cambium, phelloderm and cork

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periderm Scientific  

/ pĕr′ĭ-dûrm′ /

1. The outer, protective layers of tissue of woody roots and stems, consisting of the cork cambium and the tissues produced by it.

2. See more at cork cambium

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Other Word Forms

• peridermal adjective
• peridermic adjective

Etymology

Origin of periderm

From the New Latin word peridermis, dating back to 1830–40. See peri-, -derm

Example Sentences

Yet lycopsid trunks were composed mostly of tissue called periderm, which corresponds to modern bark and contains little lignin.

From Economist

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.

From Project Gutenberg

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.

From Project Gutenberg

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.

From Project Gutenberg

Bark external to the first periderm layer, corresponding to the primary cortex.

From Project Gutenberg