Elater mechanism of spore dispersal is found in

Options

A. Riccia
B. Marchantia
C. Funaria
D. Fern.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the elater mechanism of spore dispersal and which organism it is found in.

2. **Identifying the Options**: The options given are:
- Rickettsia
- Markentia
- Phaneria
- Fern

3. **Defining Elaters**: Elaters are specialized structures that aid in the dispersal of spores. They are typically long, spindle-shaped, and have a spiral thickening that makes them hygroscopic (able to absorb moisture).

4. **Analyzing Each Option**:
- **Rickettsia**: This is a genus of bacteria and does not have a spore dispersal mechanism involving elaters.
- **Markentia**: This is a genus of liverworts that possesses elaters in its spore capsules, which help in the dispersal of spores.
- **Phaneria**: Similar to Markentia, Phaneria is also a liverwort but does not have elaters.
- **Fern**: Ferns reproduce via spores but do not utilize elaters for spore dispersal.

5. **Conclusion**: Based on the analysis, the correct answer is **Markentia**, as it is the only option that has the elater mechanism for spore dispersal.

**Final Answer**: Markentia

---