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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Reese, E.T. - Levinson, H.S. - Downing, Mary H. - White, W. Lawrence
    Type: Article
    In: Farlowia :a journal of cryptogamic botany
    Volume: 4
    Issue: 1
    Date: 1950
    Page Range: 45--86
    Publication Info: Cambridge, Mass, Farlow Library and Herbarium of Harvard University, 1943-1955