Usage History of 'lichen'

The following chart shows how frequently 'lichen' appeared in printed materials over time. For example, the word 'lichen' occurred 2 times in books in 1681 and 42,462 times in 2008. From 1681 to 2008, the word 'lichen' was used a total of 1,182,684 times in books scanned by Google. See Reference: Google Ngram project.

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