Reindeer moss is

Options

A. Sphagnum
B. Marchantia
C. Cladonia
D. None of these

Answer

To solve the question "Reindeer moss is:", we will analyze the options provided and identify the correct answer step by step.

### Step 1: Understand what Reindeer moss is
Reindeer moss is commonly known as Cladonia rangiferina. It is a type of lichen, which is a symbiotic organism made up of a fungus and a photosynthetic partner, usually algae.

**Hint:** Look for the scientific name of Reindeer moss to identify its classification.

### Step 2: Analyze the options
- **A. Sphagnum**: This is a genus of mosses, not a lichen. It is often found in wetlands and is known for its water retention properties.
- **B. Martensia**: This is a genus of marine algae, not related to Reindeer moss.
- **C. Cladonia**: This is the correct genus that includes Reindeer moss (Cladonia rangiferina).
- **D. None of these**: Since we have identified option C as correct, this option is not applicable.

**Hint:** Compare each option with the characteristics of Reindeer moss to find the correct match.

### Step 3: Confirm the characteristics of Cladonia
Cladonia is a genus of lichens that often have a spongy appearance and can grow on rocks and soil. Reindeer moss specifically has a greyish color and can be several inches thick.

**Hint:** Look for descriptions that match the physical appearance and habitat of Reindeer moss.

### Step 4: Make a conclusion
Based on the analysis, the correct answer to the question "Reindeer moss is" is option **C. Cladonia**.

**Final Answer:** C. Cladonia