Question

What forms the cambium ring in a dicot stem during the secondary thickening

Answer 1

First of all some cells of medullary rays become meristamatic to form interfascicular cambium which is a secondary lateral meristem. Intrafascicular cambium are collectively known as vascular cambium or intra sstelar cambium. Vascular cambium is formed in the form of a complete ring which is generally made up of a single layer of cells. In dicot stem the vascular cambium is partly primary and partly secondary in origin. Two typed of cells are found in the ring of this vascular cambium. 1. fusiform initisls 2. ray initials. Fusiform initiald are long pointed ends where as ray initials are spherical rounded or oval shaped.