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  1. By: Verdoorn, Frans,
    Publication info: The Hague : Martinus Nijhoff, 1930
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  1. By: Verdoorn, Frans,
    Type: Article
    In: Lasca leaves
    Volume: 4
    Issue: Spring 1954
    Date: 1954
    Page Range: 30-35
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976
  2. By: Verdoorn, Frans,
    Type: Article
    In: Farlowia :a journal of cryptogamic botany
    Volume: 2
    Issue: 1
    Date: 1945
    Page Range: 71--82
    Publication Info: Cambridge, Mass, Farlow Library and Herbarium of Harvard University, 1943-1955