Usage History of 'lichens'

The following chart shows how frequently 'lichens' appeared in printed materials over time. For example, the word 'lichens' occurred 2 times in books in 1728 and 30,028 times in 2008. From 1728 to 2008, the word 'lichens' was used a total of 904,295 times in books scanned by Google. See Reference: Google Ngram project.

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