This Mason Forever! photo contains
sitka spruce, picea sitchensis, ponderosa, ponderosa pine, western yellow pine, bull pine, pinus ponderosa, mountain hemlock, black hemlock, and tsuga mertensiana.
There might also be
american white birch, paper birch, paperbark birch, canoe birch, betula cordifolia, betula papyrifera, birch, birch tree, beech, and beech tree.