question_answer 11)

What is periderm? How does periderm formations take place in the dicot stems.

Answer:

Phellogen, phellem and phelloderm are collectively called as periderm. Phellogen develops usually in the cortex region. Phellogen is a couple of layers thick. Phellogen cuts off cells on both sides. The outer cells differentiate into cork or phellem, while the inner cells differentiate into secondary cortex or phelloderm. All these together form periderm. All these together form perineum.