Edible lichens are lichens that have a cultural history of use as a food. Although almost all lichen are edible (with some notable poisonous exceptions like the wolf lichen, powdered sunshine lichen, and the ground lichen[1]), not all have a cultural history of usage as an edible lichen.[2][3] Often lichens are merely famine foods eaten in times of dire needs,[4] but in some cultures lichens are a staple food or even a delicacy. Some lichens are a source of vitamin D.[5]
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