1 ESO Lichen

Lichen are composite organisms formed by the symbioses (living together) of a fungus and unicellular algae. Lichens are called composite organisms because they are made up of two completely different organisms, a fungus and algae. This is a symbiotic relationship because both organisms need each other to survive. Fungus protect the algae whereas the algae provide nutrients (photosynthesis). Sometimes the partners are algae (kingdom Protista), other times cyanobacteria (kingdom Monera), formerly called blue-green algae. Some enterprising fungi exploit both at once.  Lichens grow on tree bark or bare rooks. Lichens are good indicators of air quality.

~ por silviapvadi en abril 28, 2015.