Which of these fungi does not have a branched and septate mycelium ?

Options

A. Neurospora
B. Albugo
C. Ustilago
D. Colletotrichum

Answer

To solve the question regarding which fungus does not have a branched and septate mycelium, we will analyze each of the options provided.

### Step-by-Step Solution:

1. **Understanding Mycelium**:
- Mycelium is the vegetative part of a fungus, consisting of a mass of branching, thread-like structures called hyphae.
- Mycelium can be branched and septate (having cross-walls) or non-septate (coenocytic) and unbranched.

2. **Analyzing the Options**:
- **Neurospora**:
- Neurospora belongs to the Ascomycetes class.
- Ascomycetes typically have branched and septate mycelium.
- Therefore, this option is incorrect.

- **Colitrotrichum**:
- Colitrotrichum also belongs to the Ascomycetes class.
- Similar to Neurospora, it has branched and septate mycelium.
- Thus, this option is also incorrect.

- **Basidiomycetes**:
- The question mentions a third option that belongs to Basidiomycetes.
- Basidiomycetes are known for having branched and septate mycelium as well.
- Hence, this option is incorrect.

- **Albugo**:
- Albugo belongs to the class Phycomycetes.
- Phycomycetes are known to have non-branched and non-septate mycelium.
- They are obligate parasites and their hyphae are often unbranched and can be intracellular.
- Therefore, this option is correct as it does not have branched and septate mycelium.

3. **Conclusion**:
- The fungus that does not have a branched and septate mycelium is **Albugo**.

### Final Answer:
**Albugo**