A stage peculiar to ascomycetes and basidiomycetes is

Options

A. Dikaryophase
B. Diplophase
C. Haplophase
D. Uridinial stage

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a stage that is peculiar to the Ascomycetes and Basidiomycetes, which are two phyla within the kingdom Fungi.

2. **Identifying the Phyla**:
- Ascomycetes (sac fungi) and Basidiomycetes (club fungi) are both significant groups of fungi known for their reproductive structures.
- They share a unique reproductive phase that is not found in other fungi.

3. **Recognizing the Unique Stage**:
- The unique stage that occurs during the sexual reproduction of Ascomycetes and Basidiomycetes is known as the **Dikaryon** phase.
- In this phase, two nuclei coexist within a single cell, which is a defining characteristic of these fungi.

4. **Analyzing the Options**:
- **Dicariophage**: This term refers to the dikaryotic stage, which is indeed the correct answer.
- **Diplophage**: This refers to a diploid phase, which is not specific to Ascomycetes and Basidiomycetes.
- **Haplophage**: This refers to a haploid phase, which is also not specific to these fungi.
- **Uridinophage**: This stage is specific to the rust fungus Puccinia and does not pertain to Ascomycetes or Basidiomycetes.

5. **Conclusion**: Based on the analysis, the correct answer to the question is **Dicariophage**, which represents the dikaryotic stage found in Ascomycetes and Basidiomycetes.

### Final Answer:
The stage peculiar to Ascomycetes and Basidiomycetes is **Dicariophage**.