Photo taken on Jun 10, 2012 | Photo by Andrei Katrovskiy
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Peat mosses can form thick carpet in places with too much water and too little nutrients. They also generate peat, the peat absorbs water and elevates the bog's surface; besides, peat mosses affect significantly the chemical composition of the bog's ground.

There are not much species of plants which can grow on wet moss in depressions. The green blades on the photo are pod grass. Its roots create a thin canvas running through the moss carpet and reinforcing it. When you see the pod grass on the moss — you can hope that it's possible to pass it by foot or on a vehicle (unlike some other grasses — eg, you better not try that with the beak-sedge). Well, to tell the truth, you shouldn't put a great deal of trust in such sparse carpet, even if it's with pod grass.

genus Sphagnum, peat moss Sphagnum
species Rannoch-rush, pod grass, or scheuchzeria Scheuchzeria palustris