What are the components of lichens?

Lichen is not a single organism; it is a stable symbiotic relationship between fungus and algae and / or cyanobacteria.
Like all mushrooms, lichen mushrooms require carbon to be used as a food source; this is provided by their symbiotic algae and / or cyanobacteria, which are photosynthetic.
Lichen symbiosis is considered mutually exclusive because the benefits and benefits of using fungi and photosynthetic partners called photobionts. Photobionts are green algae or cyanobacteria that provide simple sugars to their mushroom partners.

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