lichens and moss growing on the trunk of a tree.

nature leaf tree autumn yellow branch plant wildlife green trunk soil spring forest sunlight woodland abstract alga balance scale bark beautiful brown chlorophyll closeup color cyanobacterium decay dew disease environment environmental protection fresh fungi fungus growth humidity lichen mist monera moss natural vector old organism outdoor pattern photosynthesis protoctista rain rough science stem surface symbiotic texture textured thallus tropical vegetative wood lichens growing composed organisms like kingdom tree