How many of the following fungi belong to Ascomycetes ?
Ustailago, Aspergillus , Neurospora , Trichoderma , Albugo , Claviceps , Saccharomyces , Colletotrichum

Options

A. Two
B. Four
C. Five
D. Three

Answer

To determine how many of the listed fungi belong to the Ascomycetes class, we will analyze each fungus mentioned in the question:

1. **Ustilago**: This fungus is classified under Basidiomycetes, not Ascomycetes.

2. **Aspergillus**: This is a well-known genus of fungi that belongs to the Ascomycetes class.

3. **Neurospora**: This fungus is also a member of the Ascomycetes class and is commonly used in genetic studies.

4. **Trichoderma**: This fungus is classified under Deuteromycetes, which are considered imperfect fungi due to the absence of a sexual reproduction stage.

5. **Albugo**: This fungus belongs to the class Ficomycetes, specifically known for being parasitic on plants.

6. **Claviceps**: This is another fungus that belongs to the Ascomycetes class. It is known for producing ergot, a substance that can affect rye and other grains.

7. **Saccharomyces**: This is a unicellular fungus commonly known as yeast, and it is classified under Ascomycetes.

8. **Colletotrichum**: This fungus is classified under Deuteromycetes, similar to Trichoderma.

Now, let's summarize the classifications:
- Ustilago: Basidiomycetes
- Aspergillus: Ascomycetes
- Neurospora: Ascomycetes
- Trichoderma: Deuteromycetes
- Albugo: Ficomycetes
- Claviceps: Ascomycetes
- Saccharomyces: Ascomycetes
- Colletotrichum: Deuteromycetes

From the analysis, the fungi that belong to the Ascomycetes class are:
- Aspergillus
- Neurospora
- Claviceps
- Saccharomyces

Thus, there are **4 fungi** that belong to the Ascomycetes class.

**Final Answer**: 4