What constitutes the cambial ring ?

Explanation

### Step-by-Step Solution:

1. **Understanding Cambium**: The cambium is a type of meristematic tissue in plants that is responsible for secondary growth. It is essential for the formation of new vascular tissues.

2. **Types of Cambium**: There are two main types of cambium:
- **Intrafascicular Cambium**: This is the cambium found between the xylem and phloem within a vascular bundle.
- **Interfascicular Cambium**: This is the cambium that forms between two vascular bundles.

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