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Define lichens and describe its types​

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Answer:

LICHENS OCCUR in one of four basic growth forms, as illustrated below: crustose - crustlike, growing tight against the substrate. squamulose - tightly CLUSTERED and SLIGHTLY flattened pebble-like units. foliose - leaflike, with flat sheets of TISSUE not tightly bound. fruticose - free-standing branching tubes.



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