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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Rogers, D.P. - Jackson, H. S. (Herbert Spencer),
    Type: Article
    In: Farlowia :a journal of cryptogamic botany
    Volume: 1
    Issue: 2
    Date: 1943
    Page Range: 263--328
    Publication Info: Cambridge, Mass, Farlow Library and Herbarium of Harvard University, 1943-1955