Write the functions of phellogen and phelloderm.

Explanation

### Step-by-Step Solution:

1. **Understanding Phellogen**:
- Phellogen, also known as cork cambium, is a type of lateral meristematic tissue. Its primary function is to produce new cells that contribute to the formation of the periderm, which replaces the epidermis in plants undergoing secondary growth.

2. **Functions of Phellogen**:
- **Production of Meristematic Tissues**: Phellogen generates new cells that are meristematic, which means they can divide and differentiate into various types of tissues.
- **Formation of Protective Layers**: The cells produced by phellogen contribute to the formation of the outer protective layer of the plant, known as cork.
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