Which of the following is not a fungus ?

Options

A. Sargassum
B. Mucor
C. Agaricus
D. neurospora.

Answer

To determine which of the following options is not a fungus, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Groups of Fungi**:
- The kingdom Fungi is divided into several groups, including Phycomycetes (lower fungi), Ascomycetes (sac fungi), and Basidiomycetes (club fungi).

2. **Examine the Given Options**:
- We need to look at the options provided to identify which one does not belong to the kingdom Fungi.

3. **Analyze Each Option**:
- **Option 1: Sargassum** - This is identified as a type of brown algae belonging to the group Pheophyceae. Since it is classified as algae, it does not belong to the kingdom Fungi.
- **Option 2: Mucor** - This is a type of fungus that belongs to the Phycomycetes group.
- **Option 3: Neurospora** - This is a sac fungus (Ascomycetes) and is used extensively in genetic studies.
- **Option 4: Agaricus** - This is a common mushroom that belongs to the Basidiomycetes group.

4. **Conclusion**:
- Based on the analysis, Sargassum is the only option that is not a fungus. Therefore, it is the correct answer to the question.

### Final Answer:
- **Sargassum is not a fungus.**