Which of the following is not correct?

Options

A. Non flagellated unicellular algae - Chlorella
B. Leaf like algae - Laminaria
C. Maidan hair fern/walking fern - Adiantum
D. Brown algae – Batrachospermum

Answer

To determine which of the following statements is not correct, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Analyze Option 1: Non-flagellated unicellular algae (Chlorella)**
- Chlorella is indeed a unicellular green alga (Chlorophyta) and is known for being non-flagellated. This statement is correct.

2. **Analyze Option 2: Leaf-like algae (Laminaria)**
- Laminaria is classified as brown algae (Phaeophyceae) and has a leaf-like structure known as a frond. This statement is also correct.

3. **Analyze Option 3: Maidenhair fern (Adiantum)**
- Adiantum is commonly known as maidenhair fern and is indeed a type of fern. This statement is correct as well.

4. **Analyze Option 4: Brown algae is Betrocospermum**
- Betrocospermum is actually classified as red algae (Rhodophyta), not brown algae (Phaeophyceae). This statement is incorrect.

### Conclusion:
The option that is not correct is **Option 4: Brown algae is Betrocospermum**.