Male sex organs are called antherida and female sex organs are called archegonia in Bryophytes .

Explanation

**Step-by-Step Solution:**

1. **Understanding Bryophytes**: Bryophytes are non-vascular plants that include mosses, liverworts, and hornworts. They are known for their simple structure and life cycle.

2. **Identifying Male and Female Sex Organs**: In bryophytes, the male sex organs are called **antheridia** and the female sex organs are called **archegonia**.

3. **Structure of Antheridia and Archegonia**: Both antheridia and archegonia are multicellular structures. They are responsible for the production of gametes (sperm and eggs, respectively).

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