Orange lichen on sandstone

Orange lichen on sandstone

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Credit: DR NEIL OVERY/SCIENCE PHOTO LIBRARY

Caption: Orange lichen on sandstone. Lichens are formed from the a symbiotic association between a fungus and an alga. The alga is contained within the hyphae (filaments) of the fungus. Lichens are slow-growing, and are usually found on stones and the bark of trees. Photographed in the Western Cape, South Africa.

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