Why are lichens considered as a special group of organisms?

Lichens cannot be attributed to any particular kingdom in nature. Because they are a symbiotic organism. Their body, called the thallus, is made up of filaments of fungi and unicellular green algae. Mushrooms supply algae with water and minerals, and they, in return, form organic matter in the process of photosynthesis. Therefore, lichens can settle on barren soils, live in deserts and tundra, they are not demanding on moisture, but absolutely do not tolerate air pollution.

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