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  1. By: De León, P Ponce
    Type: Article
    In: Fieldiana. Botany
    Volume: 38
    Date: 1976
    Page Range: 23--29
    Publication Info: [Chicago], Chicago Natural History Museum, 1958-
  2. By: Singer, R - De León, P Ponce
    Type: Article
    In: Mycotaxon
    Volume: 14
    Issue: 1
    Date: 1982
    Page Range: 82--90
    Publication Info: Ithaca, N.Y Mycotaxon
  3. By: De León, P Ponce
    Type: Article
    In: Fieldiana. Botany
    Volume: 38
    Date: 1975
    Page Range: 1--21
    Publication Info: [Chicago], Chicago Natural History Museum, 1958-
  4. By: De León, P Ponce
    Type: Article
    In: Fieldiana. Botany
    Volume: 34
    Date: 1971
    Page Range: 27--44
    Publication Info: [Chicago], Chicago Natural History Museum, 1958-