In which bryophyte sprogonium is embedded in thallus ?

Answer

To answer the question "In which bryophyte is the sporogonium embedded in the thallus?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Bryophytes**:
- Bryophytes are non-vascular plants that include mosses, liverworts, and hornworts. They have a life cycle that alternates between a gametophyte (haploid) and sporophyte (diploid) generation.

2. **Identifying Sporophyte and Gametophyte**:
- The sporophyte is the diploid generation that produces spores through meiosis. The gametophyte is the haploid generation that produces gametes (sperm and eggs).

3. **Sporogonium Structure**:
- The sporogonium is the part of the sporophyte that is responsible for spore production. In some bryophytes, the sporogonium is not independent and remains attached to the gametophyte.

4. **Dependent Sporophytes**:
- In certain bryophytes, the sporophyte is dependent on the gametophyte for nutrition and support. This is because the sporophyte lacks chlorophyll and cannot perform photosynthesis.

5. **Identifying the Specific Bryophyte**:
- Among the bryophytes, the genus **Riccia** (or Riccia) is notable for having its sporogonium embedded within the thallus of the gametophyte. This means that the sporophyte is not a free-living structure but is instead integrated into the gametophyte.

6. **Conclusion**:
- Therefore, the bryophyte in which the sporogonium is embedded in the thallus is **Riccia**.

### Final Answer:
The bryophyte in which the sporogonium is embedded in the thallus is **Riccia**.