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