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Petersen, Ronald H.. New World Botany: Columbus to Darwin. Ruggell, Liechtenstein: A.R.G. Gantner Verlag, 2001.
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Hughes, Karen W., Ronald H. Petersen, and Edgar B. Lickey. "Using Heterozygosity to Estimate a Percentage DNA Sequence Similarity for Environmental Species' Delimitation Across Basidiomycete Fungi." New Phytologist 182, no. 4 (2009): 795-798.