lichens on the tree branch, simple slow-growing plant that typically forms a low crusty, leaflike, or branching growth on rocks, w

background beautiful biology botany branch branching brown closeup colony color crusty detail ecology ecosystem environment flora foliose forest forms fungi fungus garden gray green grey growth italy leaflike lichen lichens low macro moss mushroom natural nature old outdoor park plant rough simple slowgrowing symbiosis symbiotic texture the tree trees trunk typically wallpaper walls wild wood yellow