give a general account on lichens
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Answer:
A lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship. The combined lichen has properties different from those of its component organisms. Lichens come in many colors, sizes, and forms.
Lichen is an organism that is formed by the symbiotic association of a fungus and an alga or cyano bacterium and occurs as crusty patches or bushy growths on tree trunks, bare ground, etc. . The fungus surrounds the algal cells, often enclosing them within complex fungal tissues unique to lichen associations.Both partners gain water and mineral nutrients mainly from the atmosphere, through rain and dust. The fungal partner protects the alga by retaining water.Lichens have also been used in making dyes and perfumes, as well as in traditional medicines.
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