manna lichen

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WORDNET DICTIONARY

Noun manna lichen has 1 sense

manna lichen(n = noun.plant) - 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;

is a kind of

lecanora

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CIDE DICTIONARY

manna lichen, n.

Any of several Old World semicrustaceous or shrubby lecanoras that roll up and are blown about over African and Arabian deserts and used as food by people and animals; same as manna{2}. [WordNet 1.5]