Lichens are categorised as either being crusty, leafy or shrubby, and described as 'composite organisms'. They can often be seen growing on stone and brick walls, clay and slate roof tiles, and the bark of trees. Of note, this is an image showing 'golden shield lichen'.
Relevant image keywords:
botany, common orange lichen, crusty, flattened, foliose, foliose lichen, fungus, golden, golden shield, golden shield lichen, leafy, lichen, maritime sunburst lichen, nature, no people, old, old stone wall, outdoors, parietina, relationship, shield, shore lichen, spreading, stone, stone wall, symbiotic, symbiotic relationship, teloschistaceae, thallus, wall, xanthoria, xanthoria parietina, yellow, yellow foliose lichen, yellow lichen, yellow scale
