background colorado growth lichen lichens mountain natural nature pattern rock rocks texture fungus gap microorganism microorganisms mycobiont organism photobiont phycobiont saavem symbiotic garden gray green greenery grey layout moss mosses placed placement planned plants rockery selected selective stones terraced textures abstract appearance bark coated colors colours covered damp extensive large lichen-covered moist palm palm-tree palms spreading surface surfaces surfacing textured thick thin tree tree-trunk trunk exposed growing ocean sea oak coastal plant