Adelolecia is a genus of crustose lichens in the family Lecanoraceae. These rock-dwelling lichens form thin crusts made up of small angular patches, typically reaching about 12 cm across with distinctive black, round fruiting bodies that sit directly on the surface. The genus includes four species found in mountainous and arctic regions, where they grow on various types of rock and are distinguished by chemical compounds (lichen products) that produce colourful diagnostic reactions when tested with laboratory solutions.

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