Food is stored as floridean starch in Rhodophyceae. Mannitol is the reserve food material of which group of algae?

Explanation

**Step-by-Step Solution:**

1. **Understand the Classification of Algae:**
- Algae are classified under the kingdom Plantae and specifically under the division Thalophyta. This division includes organisms that have a thallus-like structure, meaning they do not have differentiated leaves or stems.

2. **Identify the Major Groups of Algae:**
- Within the division Thalophyta, algae are further divided into three main groups:
- **Chlorophyta** (Green Algae)
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