........... is a method of sexual reproduction where two hyphae meet together.

Explanation

**Step-by-Step Solution:**

1. **Identify the Method of Sexual Reproduction**: The question asks for a method of sexual reproduction involving two hyphae. The correct term for this process is "plasmogamy."

2. **Define Plasmogamy**: Plasmogamy is a stage in the sexual reproduction of fungi where the cytoplasm of two parent cells (hyphae) fuses together.

3. **Explain the Process**: When two hyphae (let's call them Hyphae 1 and Hyphae 2) meet, their cytoplasm merges, leading to the formation of a structure called a dikaryon.

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