Publication
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A new species of Ammothella (Pycnogonida: Ammotheidae) from deep water off San Nicolas Island, California Article
Bijdragen tot de dierkunde, 61(1), 31-41.January 1991
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Conspectus of the genera Scurrula L. and Taxillus Tieghem (Loranthaceae) in the Malesian region Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 36(1), 63-85.January 1991
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Cupaniopsis Radlk. (Sapindaceae) a monograph Article
Leiden Botanical Series, 15(1), 1-190.January 1991
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On Cyprian Helicellinae (Mollusca: Gastropoda Pulmonata: Helicidae), making a new start Article
Zoologische Mededelingen, 65(7), 99-128.January 1991
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The tuberous epiphytes of the Rubiaceae 4: A revision of Squamellaria Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 36(1), 53-61.January 1991
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On Trichia alpicola (Eder, 1921) from Switzerland (Mollusca: Gastropoda Pulmonata: Hygromiidae) and the spiral sculpture on its shell Article
Zoologische Mededelingen, 65(17), 247-250.January 1991
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Review Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 35(2), 498-498.January 1991
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Streeplijsten Article
Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland, 17(1/2), 8-8.January 1991