Publication
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A new genus of Lindsaeoid ferns Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 143(1), 599-601.January 1957
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On the position of Platycarpum Humb. et Bonpl., Henriquezia Spruce ex Bth. and Gleasonia Standl Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 141(1), 351-377.January 1957
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A revison of the genus Lindsaea in the New World with notes on Allied genera Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 139(1), 97-290.January 1957
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Comments on Greguss’s phylogenetical tree of plants Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 528-531.January 1957
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Revision of the Sapotaceae of the Malaysian area in a wider sense. IX. Pouteria Aublet Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 452-509.January 1957
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Reviews Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 533-533.January 1957
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Revision of the Sapotaceae of the Malaysian area in a wider sense. VI. Xantolis Rafinesque Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 207-234.January 1957
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A new Podostemacea from Thailand, Polypleurella micranthera Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 522-524.January 1957