Lobaria is a genus of leafy lichens commonly found in moist, shaded environments. These lichens are notable for their broad, lobed thalli, which can vary in color from green to grayish-brown. They often grow on tree bark, rocks, and soil, playing a crucial role in their ecosystems by contributing to soil formation and providing habitat for small organisms. Lobaria species are sensitive to air quality, making them important indicators of environmental health. They thrive in areas with high humidity and clean air, which is why they are often found in old-growth forests. Their presence can signal a healthy ecosystem, as they require specific conditions to survive.