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By: Reese, E.T. - Levinson, H.S. - Downing, Mary H. - White, W. LawrenceType: ArticleIn: Farlowia :a journal of cryptogamic botanyVolume: 4Series:Issue: 1Date: 1950Page Range: 45--86Publication Info: Cambridge, Mass, Farlow Library and Herbarium of Harvard University, 1943-1955Subjects: