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Until 1981 the starting point for the nomenclature of the corticioid fungi was the publication of Fries ' first volume of the Systema mycologicum , which was set at January 1 , 1821 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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