Which of these has not evolved from Psilophyton?

Options

A. Sphenopsids
B. Ferns
C. Arborescent Lycopods
D. Ginkgos

Answer

To solve the question "Which of these has not evolved from Psilophyton?", we will analyze the options provided and understand the evolutionary relationships among the groups mentioned.

### Step-by-Step Solution:

1. **Understanding Psilophyton**:
- Psilophyton is an ancient plant that belongs to the group of pteridophytes. It is considered one of the earliest vascular plants and is a member of the class Psilophyta.

2. **Identifying Related Groups**:
- The classification of pteridophytes includes several classes:
- **Pterophyta**: This class includes ferns.
- **Lycophyta**: This class includes lycopods.
- **Sphenopsida (Spinopsida)**: This includes horsetails.
- **Pteropsida**: This is another term for ferns.

3. **Analyzing the Options**:
- The options provided are:
- A) Spinopsida
- B) Ferns (Pteropsida)
- C) Arborescent Lycopods
- D) Ginkgos

4. **Evolutionary Relationships**:
- Spinopsida, ferns, and arborescent lycopods are all derived from the lineage that includes Psilophyton.
- Ginkgos, on the other hand, belong to the group of gymnosperms, which evolved separately from the lineage of Psilophyton.

5. **Conclusion**:
- Since Ginkgos do not share a direct evolutionary lineage with Psilophyton and are classified under gymnosperms, the correct answer to the question is **D) Ginkgos**.

### Final Answer:
- **D) Ginkgos**