Lichens are the slow ones, the ones that grow millimetres per year, the ones that live for centuries on bare rock. They are the first life on the stone, the pioneers, the ones that turn dead rock into living soil. And there was once a lichen that grew larger than any alive today – a broad, leafy, golden-orange disc that spread across the cliff face, 40 centimetres across, bright as a sunset. It was the giant rocky outcrop lichen, and it is gone. Size and colour made it special. A 40-centimetre lichen is a spectacular thing – a living map on the rock, its lobes overlapping and spreading, its edges curling up from the stone. Its colour was brilliant – golden-orange, almost fluorescent, visible from across a valley. It was the most visible lichen on the cliff, a beacon of life on the grey stone. It built the soil. Lichens are pioneer species – the first to colonise bare rock. They secrete acids that dissolve the stone, releasing minerals. They trap wind-blown dust. They die and decay, leaving behind a thin layer of organic matter. After decades or centuries, other plants can grow in that soil – mosses, grasses, shrubs. The giant rock lichen was a master of this process, its broad body covering more rock, creating more soil, faster than any other lichen. It also provided habitat. Tiny insects and mites lived under its lobes. Spiders hid in its crevices. It was a micro-ecosystem on the rock face. Lichens reproduce by spores and by fragments. The giant rock lichen grew slowly – perhaps a millimetre or two per year. A 40-centimetre lichen might be centuries old. That strategy works when the cliff is stable. It fails when the cliff is quarried. Quarrying, road building, and coastal development destroyed it. When Europeans arrived, they quarried the limestone cliffs for building stone and lime. They blasted the volcanic bluffs for road metal. They built houses and roads and seawalls on the rocky headlands. The giant rock lichen, which took centuries to grow, was destroyed in minutes. At the same time, collectors may have played a role. In the 19th century, naturalists collected lichens for herbaria around the world. A spectacular 40-centimetre specimen would have been a prize. Perhaps the last colonies were collected into extinction. By the 1920s, it was gone. The last specimens were probably collected by a botanist who had no idea he was holding the final individual. He pressed them, dried them, put them in a drawer. And the cliff fell silent. The smaller rock lichens survived. Xanthoria parietina still grows on rocks and trees around the world – smaller, less spectacular, but alive. It is a survivor, a pioneer, the golden shield of the stone. But the giant rocky outcrop lichen is extinct. A few pressed specimens in a herbarium, a few fragments of its DNA, and the memory of a lichen that used to paint the cliffs golden-orange. We quarried its world. Then we wondered why the cliff felt so bare.