Sphagnum squarrosum, commonly known as the spiky bog-moss or spreading-leaved bog moss is a species of moss which grows in nutrient-rich, damp soil. Typical habitats include woodland, the banks of streams and ditches; it can even be found at high altitude in damp cirques. The species often grows near sedges (Carex), rushes (Juncus) or purple moor grass (Molinia caerulea).