The complex chemical compound have a high molecular weight and the aromatic polymer in wood. A compound composed of carbon, hydrogen and oxygen, as well as retail units, many of which are aromatic compounds. Trees are much lignin. Lean is durable when plants die, lignin is digested by enzymes lignase or ligninase. The fungal microflora. The amount of lignin in normal wood is 20%-35% depending on the different wood species.