HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Young lichen on shale. Lichen growing on a shale tile, not yet having formed the fruiting bodies (apothecia) of the fungus component of this organism. Lichen is a symbiotic combination of algae and fungi. This lichen is called Parmelia, an example of a foliose lichen.
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