| 1. | Major pigments are chlorophyll a, c, fucoxanthin |
| 2. | Food is stored as complex carbohydrates which may be in the form of Laminarin or Mannitol |
| 3. | Vegetative cells have chitinous wall usually covered on the outside by a gelatinous coating of algin |
| 4. | Flagellar number and insertions are 2, unequal and lateral |
| 1. | Frond | 2. | Stipe |
| 3. | Holdfast | 4. | Rhizoid |