Origin and Activity of Cork Cambium,Vascular Regions, Certain Cells of Pericycle,Cork Cambium or Phellogen, Phelloderm, Periderm,Phellem

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Origin and Activity of Cork Cambium
Soon after start of secondary growth in vascular regions, certain cells of pericycle become meristematic and begin to divide to form cork cambium or phellogen. It produces secondary tissues towards inside and outside.

The tissue formed towards inside id parenchymatous and is called secondary cortex or phelloderm. The cells produced on outer side become suberized and dead to form cork or phellem. At places phellogen produces parenchymatous cells to give rise to lenticels. Phellem, phellogen and phelloderm are called periderm. It is protective in function.

Stelar Region of Vicia Faba Root in Transection

1. Endodermis	3. Phloem	5. Primary Xylem
2. Pericycle	4. Cambium	6. Secondary Phloem 7. Secondary Xylem

All tissues lying outside the phellem die and form bark.

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Anatomy of Flowering Plants Tissue and Meristematic Tissue Classification of Meristematic Tissue Apical Meristems of Stem and Root Permanent Tissue Simple Permanent Tissue Complex Tissues - Xylem Types of Xylum Complex Tissues - Phloem Classification of Permanent Tissue on Basis of Their Functions Types of Vascular Bundles Anatomy of Monocot Stem - Maize, Primary Structure of Stem Anatomy of Dicotyledonous Stem - Sunflower Stem Secondary Growth in Dicot System Origin and Activity of Cambium Origin and Activity of Cork Cambium Heart Wood and Sap Wood Primary Structure of Monocot Root Primary Structure of Dicot Root Secondary Growth in Dicot Roots Origin and Activity of Vascular Cambium Origin and Activity of Cork Cambiums Internal Structure of Dicot Leaf Internal Structure of Xerophytic Leaf Internal Structure of Monocot Leaf - Isobilateral Leaf