Cool piece of wood with moss and lichen

The moss is dark green, and right now it looks like little leaves that are rolled up tight.  The lichen is more of a gray-green color, near the moss.  Moss is a plant, and lichen is (usually) part fungus and part algae (algae is basically a plant).  The fungus and the algae share resources together: the fungus makes the structure, while the algae does photosynthesis and shares glucose with the fungus.  What a brilliant arrangement!