+Lichen is a unique [symbiotic](/wiki/Symbiosis) life form, an intimate partnership between [fungus](/wiki/Fungus) and alga or cyanobacterium. Thriving in diverse, often harsh, environments, it slowly colonizes bare surfaces, painting rocks and trees with quiet resilience. This resilient composite organism plays a vital ecological role, from pioneer species to air quality indicator.
+## See also
+- [Alga](/wiki/Alga)
+- [Cyanobacterium](/wiki/Cyanobacterium)
+- [Ecology](/wiki/Ecology)
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