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manna lichen

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noun
  1. any of several crustose lichens of the genus Lecanora, especially L. esculenta, found in the African and Arabian deserts, used for food by humans and other animals.
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Origin of manna lichen

First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018