Lichens symbiotic close

Lichens are symbiotic organisms composed of fungi and algae or cyanobacteria, holding great ecological and cultural significance globally.

About this subject

Lichens are a symbiotic partnership between a fungus (mycobiont) and a photosynthetic organism, usually a green alga or cyanobacterium (photobiont). This alliance allows lichens to thrive in extreme habitats, such as bare rock, tree bark, and nutrient-poor soils, acting as pioneer species in ecological succession. In Brazil, they occur across nearly all biomes, from the Amazon rainforest to the rocky fields of Serra do Cipó.

Lichens are sensitive bioindicators of air quality, absorbing nutrients and pollutants directly from the atmosphere. Their presence or absence helps monitor pollution levels, particularly in urban and industrial areas. Some species, like Cladonia stellaris, are used in traditional medicine and for natural dyes.

Brazil hosts an estimated 3,000+ lichen species, with the Chapada Diamantina region in Bahia standing out for its high endemism. Lichens also play a key role in nutrient cycling and soil formation.

Culturally, lichens have been used by indigenous peoples as tinder (due to flammability) and in shamanic rituals. In science, lichen symbiosis inspires research on biological cooperation and adaptation to harsh environments.

Frequently Asked Questions

What exactly are lichens?

Lichens are symbiotic associations between a fungus and an alga or cyanobacterium, forming a composite organism that grows on surfaces like rocks, trees, and soil.

Why are lichens important for the environment?

Lichens serve as bioindicators of air quality and contribute to soil formation. They also provide food and shelter for various organisms.

Where can lichens be found in Brazil?

Lichens occur in all Brazilian biomes, notably in Chapada Diamantina (Bahia) and the rocky fields of Minas Gerais.