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" Coprinus ebulbosus " and " Coprinus quadrifidus " are names assigned by Charles Horton Peck to what he believed were species distinct from " C. " variegata " ; they were later shown to represent the same species , and are now synonyms .
 Charles Horton Peck
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Charles Horton Peck