manna lichen

manna lichen

noun
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:
1860–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
manna lichen

noun
any of several Old World partially crustaceous or shrubby lecanoras that roll up and are blown about over African and Arabian deserts and used as food by people and animals 
WordNet® 3.0, © 2006 by Princeton University.
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