The part of a mushroom that is visible above the ground is a :

Options

A. zygospore
B. basidiocarp
C. ascogonium
D. ascocarp

Explanation

To determine the part of a mushroom that is visible above the ground, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Mushroom**:
- A mushroom consists of two main parts: the part that is above the ground and the part that is below the ground. The above-ground part is typically what we recognize as the mushroom.

2. **Identify the Above-Ground Part**:
- The above-ground part of the mushroom includes structures like the cap (or head) and gills. This is where the reproductive structures are located.

3. **Define the Options Given**:
- The options provided are:
- Zygospore
- Basidiocarp
- Ascogonium
- Ascocarp

4. **Analyze Each Option**:
- **Zygospore**: This is a thick-walled structure formed by the fusion of two gametes and is not visible above ground.
- **Basidiocarp**: This is the fruiting body of the fungus, specifically the part that is visible above ground and contains the spore-bearing structures.
- **Ascogonium**: This is the female reproductive part of Ascomycetes fungi and is not related to mushrooms.
- **Ascocarp**: This is the fruiting body of Ascomycetes fungi and also not related to mushrooms.

5. **Select the Correct Answer**:
- Based on the analysis, the correct answer is **Basidiocarp**, as it is the part of the mushroom that is visible above the ground.

### Final Answer:
The part of a mushroom that is visible above the ground is a **Basidiocarp**.