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  1. By: White, W. Lawrence - Yeager, C.C. - Shotts, Helen
    Type: Article
    In: Farlowia :a journal of cryptogamic botany
    Volume: 3
    Issue: 4
    Date: 1949
    Page Range: 399--423
    Publication Info: Cambridge, Mass, Farlow Library and Herbarium of Harvard University, 1943-1955