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This article discusses a study that examines the selection of host microbiota in arid desert lichen crusts. The researchers focused on a specific type of lichen called Endocarpon and analyzed the bacterial communities in four different layers of the lichen. The study found that the bacteria in the lichen primarily come from the soil, indicating a clear preference for specific hosts. These findings provide valuable insights into how lichen symbionts maintain a balanced relationship and how the lichen community forms in desert environments. The study also identified important bacterial species that contribute to the lichen microbiota. Overall, this research enhances our understanding of how lichens function and interact with their environment. [Extracted from the article]