Roccella is a genus of lichenized fungi, commonly known as rock lichens. These organisms are typically found on rocky surfaces and are known for their ability to thrive in harsh environments. They play a crucial role in the ecosystem by contributing to soil formation and providing habitats for various microorganisms. The most notable species within the Roccella genus is Roccella tinctoria, which has been historically used to produce natural dyes. This species contains compounds that can create a range of colors, making it valuable in textile and craft industries.