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While lichens are generally beneficial to ecosystems, they can have some negative effects. They may indicate poor air quality, as many species are sensitive to pollutants, which can mislead assessments of environmental health if interpreted incorrectly. In certain contexts, lichens can contribute to the degradation of stone and wood surfaces, as their growth can lead to physical damage over time. Additionally, some lichen species can be toxic to animals or humans if ingested.

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3d ago

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