本文着重介绍了药用地衣主要的两大类化学物质，即地衣抗生素和地衣多糖类物质的来源、生物活性等，并对地衣化学的发展前景做了展望。

This review covers research into two primary compounds from lichens: antibiotic from lichens and lichenan, and gives a detailed introduction to their bioactivity, origin and value in medicine.

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地衣，共生的有机体结合起来，真菌和藻类，可以是有力风化的动因和力量，所分泌的化学物质称为螯合物那造成岩石的破裂。

Lichens, symbiotic organisms that combine fungi and algae, can be powerful weathering agents, secreting chemicals called chelates that work to break down rock.

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