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They are composite organisms, which require a clean atmosphere with sufficient air for their growth.

Lichens are a group of terrestrial organisms, which are abundantly found growing in different places, including on rocks, gravestones, walls, tree barks, on roofs, soil, etc. They are composite organisms, which require a clean atmosphere with sufficient air for their growth. Some species of lichens are also found in many environmental conditions as they can grow on almost any surface.i.e. from sea level to high alpine elevations. According to fossil records, these organisms were found about 400 million years ago. Basically, these organisms are found in different colours, shapes, sizes and forms. Based on their physical features, they are further classified into different types. In certain cases, these organisms are also found with tiny branchlets, with flat leaf-like structures, a powder-like appearance and in various other forms. Based on their  mode of nutrition , lichens are in a symbiotic relationship between green algae and fungus. Many lichens partner include either one photobiont or more than one photobiont and one mycobiont, which generally varies. According to research, there are about 18,000 known species of lichens and it has also been estimated that around 4 to 5 per cent of the Earth’s surface are covered by lichens. Beard lichens, dog lichens, Iceland moss, oak moss, are a few good examples of lichens. Read more:  Lichens Now, let’s look at the Economic importance of lichens

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