The parasitic green algae which causes red rust in tea is ____________ .

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks for the name of the parasitic green algae that causes red rust in tea plants.

2. **Identifying the Disease**: The disease referred to as "red rust" specifically affects tea plants. It is important to recognize that this is a known disease in the context of tea cultivation.

3. **Recognizing the Causative Agent**: The causative agent of red rust in tea is a type of green algae.

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