The order Peltigerales is a group of lichen-forming fungi within the class Lecanoromycetes. Members of this order are predominantly foliose (leaf-like) or crustose (crust-like) lichens, often forming symbiotic relationships with cyanobacteria or green algae as their photosynthetic partners. Peltigerales species are commonly found in temperate and boreal forests, thriving on soil, moss, rocks, and tree bark. Many play important ecological roles, including nitrogen fixation, soil stabilization, and serving as indicators of environmental health. The order includes several well-known families such as Peltigeraceae and Nephromataceae, encompassing genera like Peltigera and Nephroma, which are notable for their large, conspicuous thalli.