Publication
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On lower tertiary Mollusca from S.W. and Central Celebes Article
Leidse Geologische Mededelingen, 15(1), 282-290.January 1950
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Dates of publication of Malaysian phyto-taxonomical literature V Article
Flora Malesiana Bulletin, 6(1), 164-168.January 1950
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Notes on the Flora of Java, V. Identification of the new species and combinations proposed by C. P. Thunberg in the Florula Javanica by L. Winberg and F. O. Widmark (1825) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 358-362.January 1950
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The Convolvulaceae of Malaysia, VI Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 337-348.January 1950
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The variability of the wood-anatomy in large and small genera Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 462-464.January 1950
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The vessels in the wood of Javan Mangrove trees Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 465-469.January 1950
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The genus Polysiphonia in the Netherlands Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 6(2), 517-526.January 1950
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Personal news Article
Flora Malesiana Bulletin, 7(1), 190-192.January 1950