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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.

Origin of manna lichen

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