Many species may be found in the fissures between patches of sphagnum moss in marshes. The boglands are a habitat of sedges and sphagnum moss. They are frequently covered in ericaceous shrubs rooted in the sphagnum moss and peat. In Japan, the custom is to grow them on a raised mound of sphagnum moss. It reaches a height of and is dominated by coarse grass, heather and sphagnum moss. They make a cup nest in sphagnum moss on or near the ground. Sphagnum moss is also of economic importance. Sphagnum moss bogs are common where there is abundant rain and poor drainage. Today, there are 12 species of sphagnum moss that can be found in Burns Bog. These include a cover of sphagnum moss, bird-wheat moss, bog moss and reindeer lichen. The depression did not contain sphagnum moss until 3,000 years later. Decayed, dried sphagnum moss has the name of peat or peat moss. Under swamp conditions, germination generally takes place on a sphagnum moss or a wet-muck seedbed. Dried sphagnum moss is used in northern Arctic regions as an insulating material. Its main constituent materials are sphagnum moss, cotton grass, deer grass, heather and sedge.