Selwyn's atrichum moss is a species of moss characterized by lush, green tufts and elongated, narrow leaves that often display a rippled or wavy appearance. Thriving in shaded, moist habitats, it forms dense, soft carpets on forest floors, which play a crucial role in the ecosystem by retaining moisture and providing a habitat for microfauna. This verdant moss distinguishes itself by the delicate, yet resilient nature of its foliage, which contributes to the understory's intricate tapestry of plant life.