which bryophyte was employed in removing kidney stones?

Options

A. Sphagnum
B. Polytrichum commune
C. Porella
D. Funaria

Answer

To determine which bryophyte was employed in removing kidney stones, we can follow these steps:

### Step 1: Identify the Bryophytes
First, we need to list the bryophytes mentioned in the question. The options provided are:
1. Sphagnum
2. Polytrichum commune
3. Perilla
4. Funaria

### Step 2: Analyze Each Option
Next, we will analyze each bryophyte to see if there is any evidence of its use in treating kidney stones.

- **Sphagnum**: This bryophyte is known for its use as a surgical dressing, particularly during World War I. It does not have a known application in treating kidney stones.

- **Polytrichum commune**: This bryophyte has been recognized for its medicinal properties, including its use in the removal of kidney stones. This makes it a strong candidate for our answer.

- **Perilla**: While this plant has various uses, including water retention in soil, it is not a bryophyte and is not known for treating kidney stones.

- **Funaria**: This bryophyte is primarily used as a soil conditioner and does not have any known application in the treatment of kidney stones.

### Step 3: Conclusion
Based on the analysis, **Polytrichum commune** is the bryophyte that has been employed in removing kidney stones. Therefore, the correct answer is:

**Polytrichum commune**