phellogen

Under the protective outer bark lies another layer of protection, the phellogen.

The periderm forms from the phellogen which serves as a lateral meristem.

Roots are composed of large amounts of corky secondary tissue consisting of phellogen.

Synonyms for cork cambium are bark cambium, pericambium and phellogen.

In some species, like ash, old and new segments of phellogen become attached through intertwined fibers, resulting in a characteristic furrowed appearance.

Together, the phellem (cork), phellogen (cork cambium) and phelloderm constitute the periderm.

The cork cambium, which is also called the phellogen, is normally only one cell layer thick and it divides periclinally to the outside producing cork.

Tree aloe bark differs from woody dicot bark in that it doesn't have a phellogen, which is the meristematic tissue that differentiates into the bark.

Cells that grow inwards from the phellogen are termed phelloderm, and cells that develop outwards are termed phellem or cork (note similarity with vascular cambium).

This is the most delicate phase of the work because, even though cutting the cork requires quite a bit of strength, the extractor must not damage the underlying phellogen or the tree will die.

Woody dicots and many nonwoody dicots have secondary growth originating from their lateral or secondary meristems: the vascular cambium and the cork cambium or phellogen.

Often a secondary covering called the periderm forms on small woody stems and many non woody plants, which is composed of cork (phellem), the cork cambium (phellogen), and the phelloderm.