Usage History of 'usnea'

The following chart shows how frequently 'usnea' appeared in printed materials over time. For example, the word 'usnea' occurred 2 times in books in 1739 and 749 times in 2008. From 1739 to 2008, the word 'usnea' was used a total of 31,150 times in books scanned by Google. See Reference: Google Ngram project.

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