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Lichen isn’t a weed or a plant problem in any way but many people worry about it. It is a growth seen on rocks and the trunks of trees that is actually two plants. Commonly growing in flat greenish, gray, brown, yellow or black patches, lichen consists of algae and fungi. They live together in a symbiotic relationship. The fungi absorb and conserve moisture and provides shelter. The algae conduct photosynthesis, grow and provide protein for the fungi. No treatment or worry needed


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