Lecanoromycetes is a class of fungi primarily known for forming lichens, which are symbiotic associations between fungi and photosynthetic organisms like algae or cyanobacteria. This class includes many species that thrive in diverse environments, from forests to deserts, and play essential roles in ecosystems by contributing to soil formation and nutrient cycling. Members of Lecanoromycetes are characterized by their unique reproductive structures, often producing fruiting bodies called apothecia. These fungi are important indicators of environmental health and biodiversity, as they can be sensitive to changes in air quality and climate conditions.