Crustose lichens form a crust that strongly adheres to the substrate, making them difficult to remove without destroying them. These lichen types lack a lower cortex, and their lower surface forms an intimate bond with the substrate they grow upon.
Characteristically found on rocks and tree bark, crustose lichens can thrive in seemingly inhospitable environments, showcasing nature's resilience and beauty. They come in various colors and contribute significantly to ecological systems.
Some fascinating examples of crustose lichens include: