These spruce-edged sphagnum bogs are found in the upper sections of Red Creek and its tributaries, often in association with thickets of speckled alder. There are similar areas throughout the High Alleghenies, most famously the Cranberry Glades. The largest one at Dolly Sods is about a mile long and half a mile wide. The thick carpet of sphagnum moss and the polytrichum moss hummocks also sustain cotton grass, round leaf sundew and the lichen known as reindeer moss. In addition to the spruce, the bog margins are frequented by ferns, sedges and the occasional balsam fir. The three-toothed cinquefoil (Sibbaldiopsis tridentata) is often abundant and orchids — for example the pink lady's slipper — are sometimes seen.