Question

what is mean by lichen?
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Answer 1

Explanation:

noun. an organism that is formed by the symbiotic association of a fungus and an alga or cyanobacterium and occurs as crusty patches or bushy growths on tree trunks, bare ground, etc. Lichens are now classified as a phylum of fungi (Mycophycophyta) pathol any of various eruptive disorders of the skin.

Answer 2

A simple slow- growing plant that typically forms a low crusty leaf like or branching growth on rocks ,walls and trees.

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