`Name`: a `fungus` from which `Galic` `acid` is obtained.

Answer

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the name of a fungus from which Gallic acid is obtained.

2. **Identify Gallic Acid**: Gallic acid is a chemical compound known scientifically as 3,4,5-trihydroxybenzoic acid. It is an organic acid that can be found in various plants and fungi.

3. **Properties of Gallic Acid**:
- It is colorless and crystalline.
- It is classified as an organic acid because it is derived from living organisms, including fungi.

4. **Sources of Gallic Acid**: While Gallic acid can be obtained from various sources such as tea leaves and oak bark, the question specifically requires the name of a fungus.

5. **Identify the Fungus**: The fungus from which Gallic acid is obtained is known as **Aspergillus niger**.

6. **Final Answer**: Therefore, the answer to the question is **Aspergillus niger**.