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Raymond van der Ham

Dr. R.W.J.M. (Raymond) van der Ham, Senior researcher - Understanding Evolution

Contact

Email: raymond.vanderham@naturalis.nl
Phone: +31 (0)71 751 9225
Room number: 1.02, Nieuwenhuizenweg 19
“I am intrigued by time and lost worlds: by organisms that disappeared forever, but left remains and traces that I might unravel.”

(photo above: Frank Jansen, Rijswijk)

Career

1973 - 1977: assistant (student-assistent), Laboratorium voor Experimentele Plantensystematiek, Rijksuniversiteit Leiden.

1977 - 1985: researcher (wetenschappelijk ambtenaar), project 'Atlas van de Nederlandse Flora', Rijksherbarium, Rijksuniversiteit Leiden.

1977 - 1978: teacher, R.K. Pedagog. Acad. Mariahoeve, 's-Gravenhage.

1985 - 1989: researcher (wetenschappelijk assistent), PhD project.

1990 - 2007: researcher (onderzoeker), Nationaal Herbarium Nederland, Universiteit Leiden.

2003 - 2010: honorary researcher palaeobotany, Nationaal Natuurhistorisch Museum / Naturalis, Leiden.

2007 - present: assistant professor (universitair docent) / senior researcher, Nationaal Herbarium Nederland, Universiteit Leiden / Nederlands Centrum voor Biodiversiteit, Naturalis (2010) / Naturalis Biodiversity Center (2013). 

Degrees

BSc (kandidaatsexamen): biology with geology (B5). Rijksuniversiteit Leiden, 1 May 1973.

MSc (doctoraalexamen): biology (incl. teaching certificate). Rijksuniversiteit Leiden, 21 June 1977. Research:

- 1973 - 1976, Taxonomic revision of Mischocarpus Blume (Sapindaceae). Supervised by P.W Leenhouts (Rijksherbarium, Leiden).

- 1975 - 1976, Pollen morphology of Mischocarpus Blume (Sapindaceae). Supervised by J. Muller (Rijksherbarium, Leiden).

- 1976 - 1977, Carbonised fruits and seeds from prehistoric settlements. Supervised by C.C. Bakels (Instituut voor Prehistorie, Leiden).

PhD: Faculteit der Wiskunde en Natuurwetenschappen, Rijksuniversiteit Leiden, 11 Oct. 1990. Thesis: Nephelieae pollen (Sapindaceae): form, function, and evolution.

Research

Research interest

  • Pollen morphology and evolution of Annonaceae, Apocynaceae, Araceae (Amorphophallus), Cucurbitaceae, Euphorbiaceae and Sapindaceae.
  • Plant macrofossils from the Maastrichtian type area (SE Netherlands and adjacent parts of Belgium and Germany; Campanian, Maastrichtian, Danian): conifers, dicots, seagrasses, etc.
  • Recent and fossil walnuts belonging to Juglans section Cardiocaryon, Juglandaceae (Northern Hemisphere, Neogene, Pleistocene).
  • Recent and fossil oak galls from Europe.
  • Drift fruits and seeds ('sea beans') on Dutch shores.
  • Ferns on stony substrates in The Netherlands.
  • Dutch materia medica collections.
  • Fossil echinoids (esp. Echinogalerus, Hemiaster, Leymeriaster and chert material) from the Maastrichtian type area (SE Netherlands and adjacent parts of Belgium and Germany; Campanian, Maastrichtian, Danian).
  • Fossils (invertebrates) from the Jurassic (Bathonian) of Normandy (France), esp. from the section between Luc-sur-Mer and Lion-sur-Mer.

Keywords

drift fruits and seeds, paleobotany, echinoids, walnuts, pollen morphology, ferns, oak galls, simplicia

Current research topics

  • Pollen morphology and evolution of Apocynaceae (Periwinkle family).
  • Fossil seagrasses from the type area of the Maastrichtian stage.
  • Taxonomy and distribution (geogr./stratigr.) of fossil butternuts (Juglans section Cardiocaryon, Juglandaceae). 
  • 'Sea beans' from northern Atlantic Ocean coasts representing an undescribed Sacoglottis (Humiriaceae) endocarp.
  • Ferns on stony substrates in Delft (The Netherlands).
  • Dutch materia medica collections.

Collaborations

  • Bierman, A.I., Universiteit Leiden, Universiteitsbibliotheek, Leiden, The Netherlands. Simplicia.
  • Burgh, J. van der, Laboratory of Palaeobotany and Palynology, Utrecht, The Netherlands. Fossil walnuts.
  • Cadée, G.C., Royal Netherlands Institute for Sea Research, Den Burg, Texel, The Netherlands. Drift fruits and seeds on Dutch shores.
  • Indeherberge, L., Zonhoven, Belgium. Fossils from the Maastrichtian type area.
  • Jagt, J.W.M., Natuurhistorisch Museum Maastricht, Maastricht, The Netherlands. Fossil echinoids from the Maastrichtian type area.
  • Konijnenburg-van Cittert, J.H.A. van, Naturalis Biodiversity Center, Leiden, The Netherlands. Plant fossils from the Maastrichtian type area.
  • Laffineur, J., Maasmechelen, Belgium. Fossils from the Maastrichtian type area.
  • Manchester, S.R., Florida Museum of Natural History, Gainesville, Florida, USA. Fossil walnuts.
  • Meuris, R., Beerzel, Belgium. Fossils from the Maastrichtian type area.
  • Nonhof, C.J., Delft. Ferns on stony substrates.
  • Renkens, S., Zaltbommel, The Netherlands. Plant fossils from the Maastrichtian type area.

Collections

Curation of pollen slide collection and teaching collection plant fossils.

Supervision PhDs

Co-promotor/supervisor

Adema, F.A.C.B. 1991. Cupaniopsis Radlk. (Sapindaceae), a monograph. Co-supervisor.

Duistermaat, H. 1996. Monograph of Arctium L. (Asteraceae). Generic delimitation (including Cousinia Cass. p.p.), revision of the species, pollen morphology, and hybrids. Co-supervisor.

Ridder-Numan, J.W.A. 1996. Historical biogeography of the Southeast Asian genus Spatholobus (Legum.-Papilionoideae) and its allies. Co-supervisor.

Buijsen, J.R.M. Phylogeny and historical biogeography of HarpulliaNephelium and Lepisanthes (Sapindaceae). Started 1990, stopped 1998. Co-supervisor.

Orozco Pardo, C.I. 2001. Evolutionary biology of Brunellia Ruiz & Pavón (Brunelliaceae, Oxalidales). Committee member.

Schot, A.M. 2004. Systematics of Aporosa (Euphorbiaceae). Co-supervisor.

Mols, J.B. 2004. From Milusa to Miliuseae to Miliusoid, Identifying clades in Asian Annonaceae. Co-supervisor.

Stroo, C.J. Pollen morphology and evolution of bat pollinated plants. Started 1997, stopped 2006. Co-promotor.

Sierra Daza, S.E.C. 2007. Re-shaping spurge pioneers. Circumscription, taxonomy and phylogeny of Mallotus (Euphorbiaceae s.s.). Co-supervisor.

Kulju, K.K.M. 2007. Phylogenetic and taxonomic studies in Macaranga, Mallotus and other acalyphoid genera (Euphorbiaceae s.s.). Co-supervisor.

Couvreur, T.L.P. 2008. Revealing the secrets of African Annonaceae. Systematics, evolution and biogeography of the syncarpous genera Isolona and Monodora. Co-supervisor.

Chaowasku, T. 2014. The Miliuseae revisited. Phylogenetic, taxonomic, and palynological studies in a major clade of Annonaceae. Co-supervisor, committee member.

Chantarasuwan, B. 2014. Taxonomy, systematics, and biogeography of Ficus subsection Urostigma (Moraceae). Co-supervisor.

Hetterscheid, W.L.A. Revision of Amorphophallus (Araceae). Started 1988, ongoing. Co-supervisor.

Teaching

Courses

Since 1985, I have been involved in teaching (parts of) various courses and excursions. The following list covers the more important items in the years 2006 and onwards.

First year

  • course 'Tree of Life - protisten, planten, schimmels'
  • excursions in Leiden and the dunes

Second year

  • course ‘Biodiversiteit - taxa in ruimte en tijd' (pollen and paleobotany)
  • flora excursions in Leiden, the dunes and Zuid-Limburg
  • marine excursion 'Normandië', France (until 2012)

Third year

  • course ‘Major clades in de Tree of Life' (pollen and paleobotany; until 2012)
  • minor 'Biodiversity and Natural Environment' (pollen; from 2013)

Graduate

  • course 'SE Asian / Tropical plant families' (pollen; until 2012)

Supervision MSc Students

2006 Co-supervisor - Thongpairoj, U. - Pollen morphology Artabotrys (Annonaceae).
2005 Supervisor - Chaowasku, T. - Pollen morphology of Miliusa (Annonaceae).
2005 Supervisor - Ven, E.A. van de. - Pollen morphology of Melodinus (Apocynaceae).
2005 Co-supervisor - Bosma, H.F. - Conifers from the Santonian of Limburg (The Netherlands).
2003 Supervisor - Pruesapan, K. - Pollen morphology of Trichosanthes (Cucurbitaceae).
2001 Supervisor - Cruden, M.A. - Pollen morphology of Callerya and Wisteria (Fabaceae).
2001 Supervisor - Hendrian - Pollen morphology of Ochrosia (Apocynaceae).
2001 Supervisor - Sagun, V.G. - Pollen morphology of the subtribe Flueggeinae (Euphorbiaceae).
1997 Supervisor - Zimmermann, Y.-M. - Pollen morphology of Alyxia (Apocynaceae).
1995 Supervisor - Kuijt, J. - Pollen morphology of Alstonia (Apocynaceae).
1994 Supervisor - Bergen, M.A. van. - Pollen morphology of Arytera (Sapindaceae).
1993 Supervisor - Tomlik, A. - Pollen morphology of Serjania (Sapindaceae).

Supervision BSc Students

2011 Supervisor - Hoogen, J.C. van den. - Pollen morphology of the genus Ochrosia (Apocynaceae).
2009 Supervisor - Mennes, C.B. - Pollen morphology and evolution in Cucurbitaceae.
2009 Supervisor - Weide, J.C. van der. - Pollen morphology and classification of the tribe Tabernaemontaneae (Apocynaceae, subfamily Rauvolfioideae).
2007 Supervisor - Lodder, S. & Rutten, E.M.J. - Pollen morphology of the Apocynaceae (subfamilies Rauvolfioideae and Apocynoideae).
2005 Co-supervisor - Huut, B.J. van. - Distribution of fossil Araucariaceae.
2005 Supervisor - Kromhout, R.P.W. - Pollen morphology of the Moraceae (excl. Ficus).
2002 Supervisor - Langeveld, J.M. - Pollen morphology of Ficus (Moraceae).
Available student projects

Publications

2018

Journals SCI, peer-reviewed

Livshultz T., Middleton D.J., Ham R.W.J.M. van der, Khew G. 2018. Generic delimitation in Apocyneae (Apocynaceae). Taxon 67: 341-358.

2017

Journals SCI, peer-reviewed

Ham R.W.J.M. van der, Konijnenburg-van Cittert J.H.A. van, Jagt J.W.M., Indeherberge L., Meuris R., Deckers M.J.M., Renkens S., Laffineur J. 2017. Seagrass stems with attached roots from the type area of the Maastrichtian Stage (NE Belgium, SE Netherlands): Morphology, anatomy, and ecological aspects. Review of Palaeobotany and Palynology 241: 49-69.
Go to website (DOI)

Journals non-SCI, peer-reviewed

Smits S., Ham R. van der 2017. Een harde noot?!. Grondboor en Hamer: Nederlandse Geologische Vereniging 71: 60-66.

Authored books

Ham R. van der, Bierman A. 2017. Van gildekast tot schoenendoos: Nederlandse simpliciaverzamelingen. 156 p. Erato, Leiden. ISBN 978-94-92165-17-6.

2016

Authored books

Ham, R. van der 2016. Simpliciaverzamelingen. Medisch Farmaceutisch Museum ‘De Griffioen’. 12 p. Stichting Medisch Farmaceutisch Museum ‘De Griffioen’, Delft.

Chapters in books

Ham, R.W.J.M. van der 2016. Pollen morphology (Flora Malesiana: Lythraceae). In: Wilde W.J.J.O. de, Duyfjes B.E.E. Flora Malesiana Vol. 22: 4-5. 4-5:

2015

Journals SCI, peer-reviewed

Chaowasku T., Johnson D.M., Ham R.W.J.M. van der, Chatrou L.W. 2015. Huberantha, a replacement name for Hubera (Annonaceae: Malmeoideae: Miliuseae). Kew Bulletin 70: 1-4.
Go to website (DOI)

Ham, R.W.J.M. van der 2015. On the history of the butternuts (Juglans section Cardiocaryon, Juglandaceae). Palaeontographica Abteilung B: Palaeobotany - Palaeophytology B 293: 125-147.

Martinetto, E., Ravazzi, C., Roghi, G., Teruzzi, G., Ham, R. van der & Zorzin, R. 2015. Neotypification of the name Juglandites bergomensis, basionym of the fossil-species Juglans bergomensis (Juglans sect. Cardiocaryon, Juglandaceae) in Europe. Phytotaxa 234: 280-286.

Journals non-SCI, peer-reviewed

Ham R. van der, Andel T.R. van, Butcher L., Hanno I., Lambrechts T., Lincicome K., Mikkelsen P., Patterson B., Perry E., Romance M. 2015. Furrowed blister pods stranded on northern Atlantic Ocean coasts represent an undescribed Sacoglottis (Humiriaceae) endocarp most similar to the fossil Sacoglottis costata. Journal of the Botanical Research Institute of Texas 9: 137-147.

Ham, R. van der 2015. Zwartkop snoept nectar (en bestuift mahoniebloemen?). Natura 112: 9.

2014

Journals SCI, peer-reviewed

Jagt J.W.M., Jackson J., Ham R.W.J.M. van der 2014. Bathysalenia skylari, a new late Turonian (Late Cretaceous) saleniid echinoid from central Texas, USA. Cretaceous Research 51: 70-74.
Go to website (DOI)

Chaowasku T., Thomas D.C., Ham R.W.J.M. van der, Smets E.F., Mols J.B., Chatrou L.W. 2014. A plastid DNA phylogeny of tribe Miliuseae: insigts into relationships and character evolution in one of the most recalcitrant major clades of Annonaceae. American Journal of Botany 101: 691-709.
Go to website (DOI)

Journals non-SCI, peer-reviewed

Chantarasuwan B., Ham R.W.J.M. van der, Heuven B.-J. van, Welzen P.C. van 2014. Pollen morphology of Ficus subsection Urostigma (Moraceae). Thai Forest Bulletin: Botany 42: 52-60.

Authored books

Neve A., Ham R.W.J.M. van der 2014. Bijenplanten: nectar en stuifmeel voor honingbijen. 511 p. EIS Kenniscentrum insecten en andere ongewervelden, Naturalis Biodiversity Center & KNNV Delfland., ISBN 9789076261003.

Nonhof C., Ham R. van der 2014. Muurflora 2014: Delft centrum en TU-noord. 44 p. KNNV afdeling Delfland,

Chapters in books

Chantarasuwan B., Ham R.W.J.M. van der, Heuven B.-J. van, Welzen P.C. van 2014. Pollen morphology of Ficus subsection Urostigma (Moraceae).

2013

Journals SCI, peer-reviewed

Chaowasku T., Ham R.W.J.M. van der, Chatrou L.W. 2013. Integrative systematics supports the establishment of Winitia, a new genus of Annonaceae (Malmeoideae, Miliuseae) allied to Stelechocarpus and Sageraea. Systematics and Biodiversity 11: 195-207.
Go to website (DOI)

Chapters in books

Ham R.W.J.M. van der 2013. Pollen morphology (Flora Malesiana: Peraceae). In: Welzen P.C. van, Esser H.-J., Prance G.T., Kartawinata E.K. (eds). Pollen morphology (Flora Malesiana: Peraceae): 122-123

2012

Journals SCI, peer-reviewed

Chaowasku T., Kessler P.J.A., Ham R.W.J.M. van der 2012. A taxonomic revision and pollen morphology of the genus Dendrokingstonia (Annonaceae). Botanical Journal of the Linnean Society 168: 76-90.
Go to website (DOI)

Weide J.C. van der, Ham R.W.J.M. van der 2012. Pollen morphology and phylogeny of the tribe Tabernaemontaneae (Apocynaceae, subfamily Rauvolfioideae). Taxon 61: 131-145.

Chaowasku T., Johnson D.M., Ham R.W.J.M. van der, Chatrou L.W. 2012. Characterization of Hubera (Annonaceae), a new genus segregated from Polyalthia and allied to Miliusa. Phytotaxa 69: 33-56.

2011

Journals SCI, peer-reviewed

Ham R.W.J.M. van der, Jagt J.W.M., Janssens H.J. 2011. Leymeriaster campestris, a new early Campanian hemiasterid echinoid from southern Limburg, the Netherlands. Netherlands Journal of Geosciences - Geologie en Mijnbouw 90: 179-185.

Chaowasku T., Kessler P.J.A., Punnadee S., Ham R.W.J.M. van der 2011. Taxonomic novelties and pollen morphological study in the genus Neo-uvaria (Annonaceae). Phytotaxa 32: 27-42.

Ham R.W.J.M. van der, Konijnenburg-van Cittert J.H.A. van, Kieft B.N., Sachs A.W. 2011. Mosacaulis spinifer gen. et sp nov.: An enigmatic Maastrichtian plant. Review of Palaeobotany and Palynology 168: 51-67.
Go to website (DOI)

Ham R. van der 2011. Geschubde mannetjesvaren in Nederland voor het eerst op een muur gevonden. Gorteria: Tijdschrift voor de Floristiek 35: 201-205.

Journals non-SCI, peer-reviewed

Wilde W.J.J.O. de, Duyfjes B.E.E., Phonsena P., Ham R.W.J.M. van der 2011. Miscellaneous South East Asian Cucurbit News IV. Thai Forest Bulletin: Botany 39: 1-22.

Chapters in books

Acevedo-Rodriguez P., Welzen P.C. van, Adema F., Ham R.W.J.M. van der 2011. Sapindaceae. Springer, Heidelberg.

Ham R.W.J.M. van der 2011. Pollen morphology (Flora Malesiana: Pandaceae). In: Welzen P.C. van (ed.). Flora Malesiana 1 (20): Acoraceae, Pandaceae, Picrodendraceae: 17-18 17-18:

Ham R.W.J.M. van der 2011. Pollen morphology (Flora Malesiana: Picrodendraceae). In: Welzen P.C. van (ed.). Pollen morphology (Flora Malesiana: Picrodendraceae): 47

Mennes C.B., Ham R.W.J.M. van der 2011. Cucurbitaceae: Pollen Morphology. 115-116: Springer, ISBN 9783642143960.

2010

Journals SCI, peer-reviewed

Ham R.W.J.M. van der 2010. In memoriam Wilhelmus Albertus van Heel (1928-2008) OBITUARY. Blumea: Journal of Plant Taxonomy and Plant Geography 55: 1-3.
Go to website (DOI)

Ham R. van der, Mennes C., Heuven B.J. van 2010. Fevilleoideae pollen (Cucurbitaceae): a study in striate ornamentation. Grana 49: 157-169.
Go to website (DOI)

Ham R.W.J.M. van der, Jagt J.W.M., Renkens S., Konijnenburg-van Cittert J.H.A. van 2010. Seed-cone scales from the upper Maastrichtian document the last occurrence in Europe of the Southern Hemisphere conifer family Araucariaceae. Palaeogeography, Palaeoclimatology, Palaeoecology 291: 469-473.
Go to website (DOI)

Authored books

Ham R. van der 2010. Muurvarens in Delft 2009. 48 p. KNNV afdeling Delfland,

Chapters in books

Mennes C.B., Ham R.W.J.M. van der 2010. Pollen morphology (Flora Malesiana: Cucurbitaceae). 11-15: ISBN 9789071236723.

Ham R. van der 2010. Fossiele eikengallen uit het Eemien van Nederland. Fossil oak galls from the Eemian of the Netherlands. 71-79:

2009

Journals SCI, peer-reviewed

Ham R.W.J.M. van der, Vreeken B.J. 2009. Mosbloempje (Crassula tillaea Lester-Garland) in het Nederlandse kustgebied. Gorteria: Tijdschrift voor de Floristiek 34: 53-56.

Ham R.W.J.M. van der 2009. Noordse streepvaren (Asplenium septentrionale (L.) Hoffm.) in Muiden: een nieuwe poging tot vestiging in Nederland. Gorteria: Tijdschrift voor de Floristiek 34: 57-60.

Couvreur T.L.P., Ham R.W.J.M. van der, Mbele Y.M., Mbago F.M., Johnson D.M. 2009. Molecular and morphological characterization of a new monotypic genus of Annonaceae, Mwasumbia, from Tanzania. Systematic Botany 34: 266-276.

Bosma H.F., Konijnenburg-Van Cittert J.H.A. van, Ham R.W.J.M. van der, Amerom H.W.J. van, Hartkopf-Froeder C. 2009. Conifers from the Santonian of Limburg, The Netherlands. Cretaceous Research 30: 483-495.
Go to website (DOI)

Hovenkamp P.H, Ham R.W.J.M. van der, Uffelen G.A. van, Hecke M. van, Dijksman J.A., Star W. 2009. Spore movement driven by the spore wall in an eusporangiate fern. Grana 48: 122-127.
Go to website (DOI)

Authored books

Burgh J. van der, Ham R. van der, Kusters W., Jagt J.W.M. 2009. Koolstof tot nadenken. 32 p. Natuurhistorisch Museum Maastricht, Maastricht.

Ham R. van der 2009. Muurflora in Delft 2009: binnenstad en TU-wijk. 32 p. KNNV afdeling Delfland,

Chapters in books

Egmond F., Ham R.W.J.M. van der 2009. Egyptian arum, supplement to a letter from Alfonso Panza to Clusius, April 1596. In: Ommen K. van. The exotic world of Carolus Clusius (1526-1609): 47-49

Egmond F., Ham R.W.J.M. van der 2009. Piece of barke, supplement to a letter from Evangelista Quattrami to Clusius, dated 5 May 1596. In: Ommen K. van (ed.). The exotic world of Carolus Clusius (1526-1609): 64-67

2008

Journals SCI, peer-reviewed

Stone G.N., Ham R.W.J.M. van der, Brewer J.G. 2008. Fossil oak galls preserve ancient multitrophic interactions. Proceedings of the Royal Society B: Biological Sciences 275: 2213-2219.
Go to website (DOI)

Ham R.W.J.M. van der, Kuijper W.J., Kortselius M.J.H., Burgh J. van der, Stone G.N., Brewer J.G. 2008. Plant remains from the kreftenheye formation (Eemian) at Raalte, The Netherlands. Vegetation History and Archaeobotany 17: 127-144.
Go to website (DOI)

Kulju K.K.M., Ham R.W.J.M. van der, Breteler F.J. 2008. Rediscovery and phylogenetic position of the incertae sedis genus Afrotrewia (Euphorbiaceae): morphological, pollen and molecular evidence. Taxon 57: 137-143.

Couvreur T.L.P., Botermans M., Heuven B.J. van, Ham R.W.J.M. van der 2008. Pollen morphology within the Monodora clade, a diverse group of five African Annonaceae genera. Grana 47: 185-210.
Go to website (DOI)

Chaowasku T., Mols J., Ham R.W.J.M. van der 2008. Pollen morphology of Miliusa and relatives (Annonaceae). Grana 47: 175-184.
Go to website (DOI)

2007

Journals SCI, peer-reviewed

Endress M.E., Ham R.W.J.M. van der, Nilsson S., Civeyrel L., Chase M.W., Sennblad B., Potgieter K., Joseph J., Powell M., Lorence D., Zimmerman Y.-M., Albert V.A. 2007. A phylogenetic analysis of Alyxieae (Apocynaceae) based on rbcL, matK, trnL intron, trnL-F spacer sequences, and morphological characters. Annals of the Missouri Botanical Garden 94: 1-35.

Ham R.W.J.M. van der, Konijnenburg-van Cittert J.H.A. van, Indeherberge L. 2007. Seagrass foliage from the Maastrichtian type area (Maastrichtian, Danian, NE Belgium, SE Netherlands). Review of Palaeobotany and Palynology 144: 301-321.
Go to website (DOI)

Cobb L., Jansen-Jacobs M.J., Ham R.W.J.M. van der 2007. Curtia ayangannae, a new species of Gentianaceae from the Pakaraima mountains, Guyana. Blumea: Journal of Plant Taxonomy and Plant Geography 52: 5-10.

Journals non-SCI, peer-reviewed

Wilde W.J.J.O. de, Duyfjes B.E.E., Ham R.W.J.M. van der 2007. Borneosicyos simplex (Cucurbitaceae), a veritable rare plant peculiar to Kinabalu Park. Flora Malesiana Bulletin 14: 33-42.

Wilde W.J.J.O. de, Duyfjes B.E.E., Ham R.W.J.M. van der 2007. Revision of the genus Gomphogyne (Cucurbitaceae). Thai Forest Bulletin: Botany 35: 45-68.

Chapters in books

Lodder S., Rutten E.M.J., Ham R.W.J.M. van der 2007. Pollen morphology (Flora Malesiana: Apocynaceae). In: Middleton D.J. (ed.). Flora Malesiana 1 (18): Apocynaceae (subfamilies Rauvolfioideae and Apocynoideae): 18-24

2006

Journals SCI, peer-reviewed

Sierra S.E.C., Aparicio M., Kulju K.K.M., Fiser Z., Welzen P.C. van, Ham R.W.J.M. van der 2006. Re-shaping Mallotus [Part 1]: Expanded circumscription and revision of the genus Cordemoya (Euphorbiaceae). Blumea: Journal of Plant Taxonomy and Plant Geography 51: 519-540.

Sagun V.G., Levin G.A., Ham R.W.J.M. van der 2006. Pollen morphology and ultrastructure of Acalypha (Euphorbiaceae). Review of Palaeobotany and Palynology 140: 123-143.
Go to website (DOI)

Ven E.A. van de, Ham R.W.J.M. van der 2006. Pollen of Melodinus (Apocynaceae): Monads and tetrads. Grana 45: 1-8.
Go to website (DOI)

Ham R.W.J.M. van der, Pruesapan K. 2006. Pollen morphology of Zehneria s.l. (Cucurbitaceae). Grana 45: 241-248.
Go to website (DOI)

Journals non-SCI, peer-reviewed

Wilde W.J.J.O. de, Duyfjes B.E.E., Ham R.W.J.M. van der 2006. Anangia, a new monotypic genus of Cucurbitaceae from East Moluccas. Reinwardtia 12: 219-222.

Authored books

Ham R.W.J.M. van der, Indeherberge L., Defour E., Meuris R. 2006. Zee-egels uit het vuursteeneluvium van Hallembaye (Montagne Saint-Pierre). Staringia 12 59 p. ISBN 9080676942.

2005

Journals SCI, peer-reviewed

Ham R.W.J.M. van der, Dortangs R.W. 2005. Structurally preserved ascomycetous fungi from the Maastrichtian type area (NE Belgium). Review of Palaeobotany and Palynology 136: 48-62.
Go to website (DOI)

Ham R.W.J.M. van der, Grob G., Hetterscheid W., Star W., Heuven B.J. van 2005. Notes on the genus Amorphophallus (Araceae) - 13. Evolution of pollen ornamentation and ultrastructure in Amorphophallus and Pseudodracontium. Grana 44: 252-265.
Go to website (DOI)

Pruesapan K., Ham R. van der 2005. Pollen morphology of Trichosanthes (Cucurbitaceae). Grana 44: 75-90.
Go to website (DOI)

Chapters in books

Ham R.W.J.M. van der 2005. Amaranthaceae (2005). In: Meijden R. van der (ed.). Heukels' Flora van Nederland (23e druk): 299-301

Ham R.W.J.M. van der 2005. Adiantum L. - Venushaar. In: Meijden R. van der (ed.). Heukels' Flora van Nederland: 61:

2004

Journals SCI, peer-reviewed

Wilde W.J.J.O., Duyfjes B.E.E., Ham R.W.J.M. van der 2004. Khmeriosicyos, a new monotypic genus of Cucurbitaceae from Cambodia. Blumea: Journal of Plant Taxonomy and Plant Geography 49: 441-446.

Tomlik-Wyremblewska A., Ham R.W.J.M. van der, Kosinski P. 2004. Pollen morphology of genus Rubus L. Part III. Studies on the Malesian species of subgenera Chamaebatus L. and Idaeobatus L.. Acta Societatis Botanicorum Poloniae 73: 207-227.

Journals non-SCI, peer-reviewed

Welzen P.C. van, Ham R.W.J.M. van der, Kulju K.K.M. 2004. Mallotus glomerulatus (Euphorbiaceae sensu stricto), a new species: description, pollen and phylogenetic position. Thai Forest Bulletin: Botany 32: 173-178.

Ham R.W.J.M. van der, Konijnenburg-van Cittert J.H.A. van, Nieuwenhuis E.A.P.M. 2004. Cunninghamites ubaghsii (Taxodiaceae?) from the Maastrichtian type area (Late Cretaceous, SE Netherlands) rediscovered. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique - Sciences de la Terre 74: 89-96.

Chapters in books

Ham R.W.J.M. van der 2004. Pollen morphology (The Families and Genera of Vascular Plants: Symplocaceae). Symplocaceae 445:

2003

Journals SCI, peer-reviewed

Ham R. van der, Heuven B.J. van 2003. A new pollen type in Old World Cucurbitaceae. Grana 42: 88-90.
Go to website (DOI)

Ham R.W.J.M. van der, Cittert J.H.A.V., Dortangs R.W., Herngreen G.F.W., Burgh J. van der 2003. Brachyphyllum patens (Miquel) comb. nov (Cheirolepidiaceae?): remarkable conifer foliage from the Maastrichtian type area (Late Cretaceous, NE Belgium, SE Netherlands). Review of Palaeobotany and Palynology 127: 77-97.
Go to website (DOI)

Sagun V.G., Ham R.W.J.M. van der 2003. Pollen morphology of the Flueggeinae (Euphorbiaceae, Phyllanthoideae). Grana 42: 193-219.
Go to website (DOI)

Bulalacao L.J., Ham R.W.J.M. van der 2003. Pollen of Southeast Asian Alchornea (Euphorbiaceae), with an overview of the pollen fossil record. Blumea: Journal of Plant Taxonomy and Plant Geography 48: 515-522.

Duyfjes B.E.E., Ham R.W.J.M. van der, Wilde W.J.J.O. de 2003. Papuasicyos, a new genus of Cucurbitaceae. Blumea: Journal of Plant Taxonomy and Plant Geography 48: 123-128.

Ham R.W.J.M. van der, Birgelen M. van 2003. The echinoid genus Echinogalerus in the Maastrichtian type area. Netherlands Journal of Geosciences - Geologie en Mijnbouw 82: 247-260.

Buijsen J.R.M., Welzen P.C. van, Ham R.W.J.M. van der 2003. A phylogenetic analysis of Harpullia (Sapindaceae) with notes on historical biogeography. Systematic Botany 28: 106-117.

Journals non-SCI, peer-reviewed

Wilde W.J.J.O. de, Duyfjes B.E.E., Gravendeel B., Ham R.W.J.M. van der, Ho B.C., Rugayah, Vo G.T.P. 2003. Callitriche nana (Callitrichaceae), a new species from Java, Indonesia. Floribunda 2: 57-66.

Ham R.W.J.M. van der, Konijnenburg-van Cittert J.H.A. van 2003. Rare conifers from the type area of the Maastrichtian (Upper Cretaceous, Southeast Netherlands). Scripta Geologica 126: 111-119.

2002

Journals SCI, peer-reviewed

Ham R. van der, Heuven B.J. van 2002. Evolutionary trends in Winteraceae pollen. Grana 41: 4-9.

Journals non-SCI, peer-reviewed

Neumann C., Jagt J.W.M., Ham R.W.J.M. van der 2002. Rare Campanian echinoids from Höver and Misburg (Hannover area, Lower Saxony, Germany). Mitteilungen aus dem Museum für Naturkunde in Berlin - Geowissenschaftliche Reihe 5: 121-139.

Chapters in books

Ham R.W.J.M. van der 2002. Palynology (Flora Malesiana: Potamogetonaceae). In: Larssen K., Wiegleb G., Hartog C. den (eds.). Flora Malesiana 1 (16): Revisions, Potamogetonaceae: 176-177 176-177:

Ham R.W.J.M. van der 2002. Palynology - Zosteraceae. Zosteraceae 16:

Ham R.W.J.M. van der 2002. Palynology - Cymodoceaceae. Cymodoceaceae 202:

Ham R.W.J.M. van der 2002. Palynology - Caryophyllaceae.

2001

Journals SCI, peer-reviewed

Hetterscheid W.L.A., Ham R.W.J.M. van der 2001. Notes on the genus Amorphophallus (Araceae) - 11. New and obsolete species from East Malaysia and continental southeast Asia. Blumea: Journal of Plant Taxonomy and Plant Geography 46: 253-282.

Ham R.W.J.M. van der, Konijnenburg-van Cittert J.H.A. van, Burgh J. van der 2001. Taxodiaceous conifers from the Maastrichtian type area (Late Cretaceous, NE Belgium, SE Netherlands). Review of Palaeobotany and Palynology 116: 233-250.

Ham R.W.J.M. van der, Zimmermann Y.M., Nilsson S., Igersheim A. 2001. Pollen morphology and phylogeny of the Alyxieae (Apocynaceae). Grana 40: 169-191.

2000

Authored books

Ham R. van der 2000. Varens in Delft. 53 p. KNNV afd. Regio Delft,

Chapters in books

Ham R.W.J.M. van der 2000. Palynology - Myristicaceae. Myristicaceae 19-21:

Jagt J.W.M., Ham R.W.J.M. van der 2000. Micropsis caementum Jagt & van der Ham, sp. nov., Plagiochasma lammersmaxi Jagt & van der Ham sp. nov.. 239-240, 252-254:

1999

Journals SCI, peer-reviewed

Jagt J.W.M., Ham R.W.J.M. van der, Meuris R., Indeherberge L. 1999. A note on Salenia Gr. nutrix Peron and Gauthier, 1881 (Echinoidea) from the Maastrichtian type area (southeastern Netherlands, northeastern Belgium). Journal of Paleontology 73: 663-666.

Journals non-SCI, peer-reviewed

Ham R.W.J.M. van der 1999. Pollen morphology of Bayabusua (Cucurbitaceae) and its allies. Sandakania 13: 17-22.

Authored books

Ham R.W.J.M. van der, Kaas J.P., Kerkvliet J.D., Neve A. 1999. Pollenanalyse: stuifmeelonderzoek van honing voor imkers, scholen en laboratoria. 156 p. Stichting Landelijk Proefbedrijf voor Insektenbestuiving en Bijenhouderij Ambrosiushoeve, Hilvarenbeek.

Thanikaimoni K., Ham R.W.J.M. van der 1999. Eighth bibliographic index to the pollen morphology of angiosperms. Publications Le Département d'Écologie de l'Institute Français de Pondichéry 39 346 p.

1998

Journals SCI, peer-reviewed

Ham R.W.J.M. van der, Hetterscheid W.L.A., Heuven B.J. van 1998. Notes on the genus Amorphophallus (Araceae) - 8. Pollen morphology of Amorphophallus and Pseudodracontium. Review of Palaeobotany and Palynology 103: 95-142.

Chapters in books

Ham R.W.J.M. van der 1998. (Pollen morphology of) Dyera. 28: Blumea,

1997

Journals SCI, peer-reviewed

Kuijt J., Ham R.W.J.M. van der 1997. Pollen morphology of Alstonia (Apocynaceae). Grana 36: 96-104.

Ridder-Numan J.W.A., Ham R.W.J.M. van der 1997. Pollen morphology of Butea, Kunstleria, Meizotropis and Spatholobus (Leguminosae, Papilionoideae), with notes on their position in the tribes Millettieae and Phaseoleae. Review of Palaeobotany and Palynology 96: 255-280.

Journals non-SCI, peer-reviewed

Ham R.W.J.M. van der 1997. Gezocht: een bijzonder plantje!. Delft op Donderdag 26 juni/10 juli: 13, 6.

Chapters in books

Ham R.W.J.M. van der 1997. Palynology - Rafflesiaceae. Rafflesiaceae 6-7:

Ham R.W.J.M. van der 1997. Palynology - Boraginaceae. Boraginaceae 48-51:

Ham R.W.J.M. van der 1997. Palynology - Daphniphyllaceae. Daphniphyllaceae 147-148:

Ham R.W.J.M. van der 1997. Palynology - Illiciaceae. Illiciaceae 173-174:

Ham R.W.J.M. van der 1997. Palynology - Schisandraceae. Schisandraceae 187-189:

Ham R.W.J.M. van der 1997. Palynology - Loranthaceae. Loranthaceae 215-217:

Ham R.W.J.M. van der 1997. Palynology - Viscaceae. Viscaceae 406-408:

1996

Journals non-SCI, peer-reviewed

Turner H., Ham R.W.J.M. van der 1996. A taxonomic and pollen morphological revision of the genus Gongrodiscus (Sapindaceae). Bulletin du Muséum National d'Histoire Naturelle Paris 4: 339-349.

Chapters in books

Ham R.W.J.M. van der 1996. Amaranthaceae (1996). In: Meijden R. van der (ed.). Heukels' Flora van Nederland: 124-126:

Ham R.W.J.M. van der 1996. Mischocarpus Blume, nom. cons.. Sapindaceae 329-333:

Ham R.W.J.M. van der 1996. Palynology - Caesalpiniaceae. Caesalpiniaceae 416-417:

Ham R.W.J.M. van der 1996. Palynology - Geitonoplesiaceae. Geitonoplesiaceae 732:

Ham R.W.J.M. van der 1996. Palynology - Hernandiaceae. Hernandiaceae 739:

Ham R.W.J.M. van der 1996. Palynology - Lowiaceae. Lowiaceae 767:

1995

Journals SCI, peer-reviewed

Bergen M.A. van, Ham R.W.J.M. van der, Turner H. 1995. Morphology evolution of Arytera pollen (Sapindaceae, Cupanieae). Blumea: Journal of Plant Taxonomy and Plant Geography 40: 195-209.

Journals non-SCI, peer-reviewed

Jagt J.W.M., Ham R.W.J.M. van der 1995. First record of the echinoid genus Tylocidaris Pomel 1883 from the type Maastrichtian of the Netherlands. Paläontologische Zeitschrift 69: 233-239.

Ham R.W.J.M. van der, Baas P., Bakker M.E., Boesewinkel F.D., Bouman F., Heuven B.J. van, Klaassen R.K.W.M. 1995. Bottegoa Chiov. transferred to the Ptaeroxylaceae. Kew Bulletin 50: 243-265.

Ham R.W.J.M. van der 1995. Hemiaster (Leymeriaster) eluvialis, a new echinoid from the late Maastrichtian of NE Belgium and SE Netherlands. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique - Sciences de la Terre 65: 153-164.

Jagt J.W.M., Deckers M., Dhondt A.V., Dortangs R.W., Felder P.J., Felder W.M., Jäger M., Keutgen N., Kuypers M., Michels G., Reynders J., Simon E., Ham R.W.J.M. van der, Knippenberg P. van, Neer R. van (Working Group Beutenaken/Vijlen Members) 1995. Preliminary report of field work at Altembroeck (NE Belgium, Early Maastrichtian). Professional Paper - Ministere des Affaires Economiques 276: 1-20.

Chapters in books

Ham R.W.J.M. van der 1995. Palynology - Meliaceae. Meliaceae 6-7:

1994

Journals SCI, peer-reviewed

Ham R.W.J.M. van der 1994. Pollen morphology of the Stemonaceae and Pentastemonaceae. Acta Botanica Gallica 141: 285-293.

Ham R.W.J.M. van der, Tomlik A. 1994. Serjania pollen and the origin of the tribe Paullinieae (Sapindaceae). Review of Palaeobotany and Palynology 83: 43-53.

Journals non-SCI, peer-reviewed

Forman L.L., Ham R.W.J.M. van der, Harley M.M., Lawrence T.J. 1994. Rosselia, a new genus of Burseraceae from the Louisiade Archipelago, Papua New Guinea. Kew Bulletin 49: 614-619.

Authored books

Tissot C., Ham R.W.J.M. van der 1994. Seventh bibliographic index to the pollen morphology of angiosperms. Publications Le Département d'Écologie de l'Institute Français de Pondichéry 36 345 p.

Chapters in books

Ham R.W.J.M. van der 1994. Palynology - Sapindaceae. Sapindaceae 423-425:

Ham R.W.J.M. van der 1994. Mischocarpus (Flora Malesiana). Mischocarpus 658-669:

1993

Journals SCI, peer-reviewed

Segaar P.J., Ham R.W.J.M. van der 1993. Pollen of Scutinanthe brunnea compared with other burseraceous pollen types: a remarkable case of divergence. Review of Palaeobotany and Palynology 79: 297-334.

Adema F., Ham R.W.J.M. van der 1993. Cnesmocarpon (gen. nov.), Jagera, and Trigonachras (Sapindaceae, Cupanieae) - phylogeny and systematics. Blumea: Journal of Plant Taxonomy and Plant Geography 38: 173-215.

Chapters in books

Ham R.W.J.M. van der 1993. Palynology - Rosaceae. Rosaceae 231-232:

Ham R.W.J.M. van der 1993. Palynology - Amaryllidaceae. Amaryllidaceae 353-354:

Ham R.W.J.M. van der 1993. Palynology - Flora Malesiana: Alliaceae. Alliaceae 375-376:

Ham R.W.J.M. van der 1993. Palynology - Coriariaceae. Coriariaceae 387-388:

Ham R.W.J.M. van der 1993. Palynology - Pentastemonaceae. Pentastemonaceae 396-397:

Ham R.W.J.M. van der 1993. Palynology - Stemonaceae. Stemonaceae 400:

1992

Chapters in books

Ham R.W.J.M. van der 1992. Palynology - Mimosaseae. Mimoscaceae 13-14, 38:

1991

Journals SCI, peer-reviewed

Ham R.W.J.M. van der 1991. Pollen morphology of the Stemonaceae. Blumea: Journal of Plant Taxonomy and Plant Geography 36: 127-159.

1990

Authored books

Ham R.W.J.M. van der 1990. Nephelieae pollen (Sapindaceae): form, function, and evolution. Leiden Botanical Series 13 255 p. ISBN 9071236072.

Chapters in books

Ham R.W.J.M. van der 1990. Amaranthaceae (1990). In: Meijden R. van der (ed.). Heukels' Flora van Nederland: 120-122:

1989

Journals SCI, peer-reviewed

Ham R.W.J.M. van der, Heuven B.J. van 1989. Evolutionary trends in the morphology and harmomegathy of the pollen of the genus Guioa (Sapindaceae, Cupanieae). Blumea: Journal of Plant Taxonomy and Plant Geography 34: 21-60.

Ham R.W.J.M. van der 1989. New observations on the pollen of Ctenolophon Oliver (Ctenolophonaceae), with remarks on the evolutionary history of the genus. Review of Palaeobotany and Palynology 59: 153-160.

Chapters in books

Ham R.W.J.M. van der 1989. 147 distribution maps.

Ham R.W.J.M. van der 1989. Palynology - Sabiaceae. Sabiaceae 681:

1988

Journals non-SCI, peer-reviewed

Ham R.W.J.M. van der 1988. Echinoids from the Early Palaeocene (Danian) of the Maastricht area (NE Belgium, SE Netherlands): preliminary results. Mededelingen van de Werkgroep voor Tertiaire en Kwartaire Geologie 25: 127-161.

Chapters in books

Ham R.W.J.M. van der 1988. Palynology - Coniferales. Coniferales 342-344:

Ham R.W.J.M. van der 1988. Palynology - Polygalaceae. Polygalaceae 457:

Ham R.W.J.M. van der 1988. Palynology - Cruciferae. Cruciferae 542:

Ham R.W.J.M. van der 1988. Palynology - Linaceae. Linaceae 608-609:

Ham R.W.J.M. van der 1988. Palynology - Ixonanthaceae. Ixonanthaceae 621-622:

Ham R.W.J.M. van der 1988. Palynology - Ctenolophonaceae. Ctenolophonaceae 630-631:

1987

Authored books

Ham R.W.J.M. van der, Sosef M., Bakker A. de 1987. Flora van Delft en Omstreken. 106 p. Natuur en Milieucentrum De Papaver, Delft.

Ham R.W.J.M. van der, Wit W. de, Zuidema G., Birgelen M. van 1987. Zeeëgels uit het Krijt en Tertiair van Maastricht, Luik en Aken: een atlas van de zeeëgels uit het Campaniën, Maastrichtiën en Daniën van Zuid limburg en aangrenzende delen van België en Duitsland. Publicaties van het Natuurhistorisch Genootschap 36 91 p. ISBN 9070811049.

1985

Chapters in books

Ham R.W.J.M. van der 1985. 100 distribution maps with accompanying texts (Brachypodium pinnatum: with A.W. van de Hoef).

1983

Chapters in books

Graaf D.Th. de, Graatsma B.G., Ham R.W.J.M. van der, Willems J.H. 1983. Flora en vegetatie van de Sint Pietersberg: vergane glorie en behouden rijkdom. 487-524:

Ham R.W.J.M. van der 1983. Amaranthaceae. In: Meijden R. van der (ed.). Heukels' Flora van Nederland: 107-109:

1980

Chapters in books

Ham R.W.J.M. van der 1980. Chapter 2 (Nederland / The Netherlands, p. 11-17) and 35 distribution maps with accompanying texts (Cuscuta epilinum: with R.M. van Urk, Gentiana cruciata: with G.J.C.M. van Vliet). 11-17:

1977

Journals SCI, peer-reviewed

Ham R.W.J.M. van der 1977. A revision of Mischocarpus (Sapindaceae). Blumea: Journal of Plant Taxonomy and Plant Geography 23: 251-288.

Ham R.W.J.M. van der 1977. Notes on Arytera (Sapindaceae). Blumea: Journal of Plant Taxonomy and Plant Geography 23: 289-300.

Ham R.W.J.M. van der 1977. Pollen morphology of the genus Mischocarpus (Sapindaceae). Blumea: Journal of Plant Taxonomy and Plant Geography 23: 301-335.