In which of the following elater mother cells and spore mother cells belong to same generation

Options

A. Marchantia
B. Reboulia
C. Riccardia
D. Dryopteris.

Answer

To determine in which of the following organisms elater mother cells and spore mother cells belong to the same generation, we need to analyze the options provided: Mycanthia, Ricardia, and Diopteris.

### Step-by-Step Solution:

1. **Understanding Elater Mother Cells and Spore Mother Cells**:
- Elater mother cells (EMCs) are involved in the production of elaters, which help in the dispersal of spores in certain plants.
- Spore mother cells (SMCs) are responsible for producing spores through meiosis.

2. **Identifying Generational Context**:
- In plant life cycles, there are two main generations: the gametophyte generation (haploid) and the sporophyte generation (diploid).
- Both EMCs and SMCs are typically found in the sporophyte generation.

3. **Analyzing Mycanthia**:
- Mycanthia is a type of bryophyte (moss) where both elater mother cells and spore mother cells can exist in the same generation.
- In Mycanthia, the sporophyte generation produces both elaters and spores.

4. **Examining Other Options**:
- **Ricardia**: This is another bryophyte, but it has a different structure and lifecycle where EMCs and SMCs may not be in the same generation.
- **Diopteris**: This is a fern, which also has distinct generations where EMCs and SMCs do not belong to the same generation.

5. **Conclusion**:
- Based on the analysis, the correct answer is **Mycanthia**, as both elater mother cells and spore mother cells are present in the sporophyte generation of this organism.

### Final Answer:
**Mycanthia**