periderm

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per·i·derm

, periderma (per'i-derm, -i-dĕr'mă),
The outermost layer of the epidermis of the embryo and fetus to the sixth month of intrauterine life; desquamated peridermal cells are a considerable component of the vernix caseosa.
Synonym(s): epitrichium
[peri- + G. derma, skin]

periderm

A transiently expressed superficial layer that surrounds the developing epidermis.

per·i·derm

, periderma (per'i-dĕrm, -dĕr'mă)
The outermost layer of the epidermis of the embryo and fetus up to the sixth month of intrauterine life; desquamated epitrichial cells are a considerable component of the vernix caseosa.
Synonym(s): epitrichium.
[peri- + G. derma, skin]

periderm

a protective tissue formed in roots and stems that has undergone SECONDARY THICKENING, consisting of an outer cork zone, an underlying phellogen (cork cambium) and with a phelloderm (secondary cortex) beneath that.
References in periodicals archive ?
During preliminary experiments, whole bark meals were subjected to a variety of different grinding operations with the blender to determine whether the action of the rotating blade would preferentially grind the seemingly delicate phloem and obliterated phloem tissues more than the harder periderms with their interlocking spiculate stone cells (sclereids).
Specifically, by grinding in a laboratory blender, we were able to generate a bark fraction rich in periderm tissue with its interlocking spiculate stone cells (sclereids).
The first periderm formed grows during irregular periods of cork cambial activity, often keeping pace with the lateral growth of the stem for many years.
Periderm. Highly suberized walls are arranged as the last concentric band of the stem.
Periderm. Formed by a concentric band of brachysclereids with very thick walls, a suberized parenchyma that includes brachysclereid packages and an outer epidermic layer.
These lignified cells are not associated with the development of a periderm. Many clorenchymatous cells continue to be alive, and stems are green.