In Agaricus, clamp connections and dolipore septa are shown by the hyphae of

Options

A. Primary mycelium
B. Secondary mycelium
C. Monokaryotic mycelium
D. Coenocytic mycelium

Answer

To answer the question regarding which type of mycelium in Agaricus exhibits clamp connections and dolipore septa, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**:
- Understand that Agaricus is a genus of fungi that belongs to the class Basidiomycetes, commonly known as club fungi.

2. **Define Key Terms**:
- **Clamp Connections**: These are specialized structures that form lateral connections between adjacent cells in the hyphae of certain fungi, facilitating the distribution of nuclei.
- **Dolipore Septa**: These are septa (dividing walls) in the hyphae that contain a single large pore, allowing for the passage of cytoplasm and organelles between cells.

3. **Examine the Types of Mycelium**:
- **Primary Mycelium**: This is the initial mycelial stage that forms after spore germination; it is typically haploid and does not exhibit clamp connections or dolipore septa.
- **Secondary Mycelium**: This mycelium forms after the fusion of two primary mycelia (plasmogamy) and is typically dikaryotic (having two nuclei per cell). It is characterized by the presence of clamp connections and dolipore septa.
- **Monocariotic Mycelium**: This refers to mycelium with a single nucleus per cell, which does not typically exhibit these structures.
- **Sinusitic Mycelium**: This term is less commonly used and does not specifically relate to the structures in question.

4. **Select the Correct Answer**:
- Based on the definitions and characteristics, the correct answer is **secondary mycelium**, as it is the type that shows both clamp connections and dolipore septa.

### Final Answer:
In Agaricus, clamp connections and dolipore septa are shown by the hyphae of **secondary mycelium**.

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