Lichens are formed as the symbiotic association between which organisms?

Explanation:

• The term ''Lichen'' was given by Theophrastus.
• Study of Lichens - Lichenology.
• Father of Lichenology - Erik acharius
• Lichen is a composite thalloid structure of algae & fungi.
• The algal part of Lichen is called phycobiont and the fungal part is called mycobiont. Both algae & fungi remain in symbiotic association i.e. they are beneficial for each other.

Important Points

• Lichens are good indicators of air pollution. 
• Lichens are sensitive towards SO₂(sulphur dioxide). They die in more concentration of SO₂. Therefore they are not found in those areas (polluted areas) where the concentration of SO₂ is high.