Abstract
Historic and modern efforts to understand lichen diversity and evolution have overwhelmingly concentrated on that of the fungal partner, which represents one of the most taxonomically diverse nutritional modes among the Fungi. But what about the algal and cyanobacterial symbionts? An explosion of studies on these cryptic symbionts over the past 20+ years has facilitated a richer understanding of their diversity, patterns of association, and the symbiosis itself. In a From the Cover article in this issue of Molecular Ecology, Dal Forno et al. (2021) provide new insight into one of the most fascinating lichen symbioses. By sequencing cyanobacterial symbionts from over 650 specimens, they reveal the presence of overlooked cyanobacterial diversity, evidence for symbiont sharing among distantly related fungi, and utilize a comparative dating framework to demonstrate temporal discordance among interacting fungal and cyanobacterial lineages.
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