Lichens can be used as:
1. Bio-indicator for water and air pollution
2. Initial vegetation for waste lands
3. Source of wood
4. To check the air pollution
There exists a close association between the alga and the fungus within a lichen. The fungus:
1. | Provides food for the alga |
2. | Provides protection, anchorage and absorption for the alga |
3. | Fixes the atmospheric nitrogen for the alga |
4. | Releases oxygen for the alga |