lichen on a bark of a tree. textured lichen on bark of a tree in the woods. natural textures. lichen on tree trunk. plants, nature

area background bark biochemistry biological biology botany branch cell closeup damp detail ecology ecosystem effect environment fir forest fungus gray growth habitat lichen macro moss mossy mushrooms natural nature organic parasitic pattern plant relationship rough rugged stem stump surface symbiotic texture textured timber timberland tree trunk vitality wall wood woody