Phellem vs Phelloderm
(Similarities and Differences between Phellem and Phelloderm)
During the secondary growth in both stem and root, the peripheral tissues like epidermis, hypodermis and cortex are replaced by a new secondary tissue called the Periderm (bark). The periderm composed of three components: (1) Phellogen, (2) Phellem and (3) Phelloderm.
(1). Phellogen: Phellogen is the cork cambium, a layer of meristematic tissue which produces the phellem and Phellogen together known as the periderm or bark.
(2). Phellem: Phellem is the actual cork, produce by the phellogen towards the outer side.
(3). Phelloderm: Phelloderm is the secondary cortex, produced by the phellogen towards the inner side.
Even though the phellem (cork) and phelloderm (secondary cortex) are produced by the same meristematic tissue (phellogen), they show many differences. The current post discusses the Similarities and Differences between the Phellem and Phelloderm with a Comparison Table.
Similarities between Phellem and Phelloderm
Ø Both phellem and phelloderm are secondary tissues.
Ø Both are produced by the cork cambium – phellogen.
Ø Both are parenchymatous cells.
Ø Both form the component of bark.