is a celebration of the extraordinary biology, beauty, and resilience of two unassuming organisms. Endowed with unique abilities to thrive in extreme habitats, mosses and lichens defy easy categorization. Mosses, which are integral to the plant kingdom, and lichens, which are a kingdom unto themselves, colonize a variety of landscapes from rainforests to deserts to urban streets. Long neglected for lacking flowers, these organisms are now beloved for their significant role in maintaining the health of our world’s ecosystem.   Elizabeth Lawson describes how mosses and lichens shape landscapes, prevent erosion, and sequester carbon, but she also offers a wide-ranging introduction to the biologists, artists, and writers inspired by their beauty. will inspire a newfound appreciation for these unsung heroes of the natural world.