Formation of vascular cambium:
- The dicotyledonous stems are characterized by presence of cambium in between the primary xylem and primary phloem in each vascular bundle. It is called fascicular cambium.
- This fascicular cambium is derived from procambium of shoot apical meristem.
- Secondary growth initiates by the formation of new cambium in the primary medullary rays.
- The parenchymatous cells beside the fascicular cambium become meristematic and develop a new cambium, called interfascicular cambium.
- The fascicular and interfascicular cambium join with each other to form a complete ring of vascular cambium
Secondary Growth in Dicotyledonous Roots: Secondary growth in dicotyledonous roots occurs by the initiation and activity of two secondary meristems
- Vascular cambium.
- Cork cambium (or phellogen)