leväyhteisö

Leväyhteisö, also known as a lichen, is a composite organism formed by the symbiotic association of a fungus and an alga or cyanobacterium. This unique relationship is characterized by the fungus providing structural support and protection, while the alga or cyanobacterium performs photosynthesis, producing food through sunlight. The fungus absorbs water and nutrients from the environment, which it then shares with the alga or cyanobacterium. This mutualistic relationship allows lichens to thrive in a variety of environments, including extreme conditions where other organisms cannot survive.

Lichens are found worldwide and play a significant role in various ecosystems. They are often the first organisms to colonize bare rock surfaces, contributing to soil formation and nutrient cycling. Some lichens have been used in traditional medicine and as indicators of air pollution. The study of lichens, known as lichenology, provides valuable insights into environmental conditions and ecological processes. Despite their simple appearance, lichens are complex organisms with diverse forms and functions, making them an important subject of scientific research.