SDI of 277 for lodgepole pine and 416 for subalpine fir. Significant damage is also caused to subalpine fir. It is a particularly important disease in lodgepole pine and subalpine fir as well. This forest has Engelmann spruce, mountain hemlock, and subalpine fir. The forests are dominated by lodgepole pine, whitebark pine, subalpine fir, and Engelmann spruce. Hybrid spruce and subalpine fir dominate climax forests. The Engelmann spruce and the subalpine fir are commonly found together. The most common fir is Pacific silver fir and subalpine fir may also be plentiful. The forest islands typically consist of mountain hemlock, subalpine fir, and Alaska cedar. Engelmann spruce, subalpine fir, and limber pine. Subalpine fir is abundant in cooler, moister subzones. Subalpine fir is a major associate to the north. In the east and other drier areas, the subalpine zone is dominated by subalpine fir. Aspen, Engelmann spruce, subalpine fir trees, and limber pine also grow here. In the alpine level, Alaskan yellow cedar, subalpine fir, and mountain hemlock grow.