Niels Jacobsen

Niels Jacobsen

Professor, emeritus

ORCID: 0000-0003-3932-1293

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  1. Published

    The Cryptocoryne (Araceae) of Thailand

    Jacobsen, Niels, Idei, T. & Sookchaloem, D., 2008, Abstracts: Lecture. p. 32 1 p.

    Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

  2. Published

    A reassessment of the genus Barclaya (Nymphaeaceae) including three new species

    Jacobsen, Niels, Ganapathy, H., Ipor, I., Jensen, Karen Rysbjerg, Komala, T., Mangsor, K. N. A., Nordin, F. A., Othman, A. S., Rusly, R., Siow, J., Wongso, S. & Ørgaard, Marian, 2022, In: Nordic Journal of Botany. 2022, 5, 41 p., e03392.

    Research output: Contribution to journal › Journal article › Research › peer-review

  3. Published

    Natural hybridization – recombination – an ever-ongoing process

    Jacobsen, Niels & Ørgaard, Marian, 2017, Abstract of 17th Flora of Thailand Conference: Taxonomic knowledge and a sustainable future. p. 41 1 p.

    Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

  4. Published

    New taxonomical considerations and nomenclatural changes in the Cryptocoryne cordata complex (Araceae)

    Jacobsen, Niels, Wongso, S. & Ørgaard, Marian, 2023, In: Aroideana. 46, 3, 23 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  5. Published

    Artificial hybrids in Cryptocoryne (Araceae) 6. Hybridization between various species

    Jacobsen, Niels, Bastmeijer, J. D., Idei, T., Wongso, S. & Ørgaard, Marian, 2020, In: Aroideana. 43, 1&2, p. 225-239 15 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  6. Published

    Artificial hybrids in Cryptocoryne (Araceae) 3. Hybridization between species from Borneo

    Jacobsen, Niels, Bastmeijer, J. D., Idei, T., Ipor, I., Wongso, S. & Ørgaard, Marian, 2019, In: Aroideana. 42, 2&3, p. 57-90

    Research output: Contribution to journal › Journal article › Research › peer-review

  7. Published

    The identity of Cryptocoryne crispatula var. tonkinensis (Araceae)

    Jacobsen, Niels, Bastmeijer, J. D., Bogner, J., Du, N. V., Hong, Q. B. & Ørgaard, Marian, 2015, In: Willdenowia. 45, 2, p. 177-182 6 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  8. Published

    Einige Fundorte vonCryptocoryne crispatula (Araceae) in nördlichen Vietnam

    Jacobsen, Niels, Gersthofen, J. B., Van Du, N., Hong, Q. B. & Ørgaard, Marian, 2015, In: Aqua Planta. 40, 3, p. 92-104 13 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  9. Published

    Cryptocoryne hybrids (Araceae) 3: Hybrids between Cryptocoryne cordata and Cryptocoryne nurii from southern Peninsular Malaysia

    Jacobsen, Niels, Bastmeijer, J. D., Ganapathy, H., Ipor, I., Jensen, Karen Rysbjerg, Komala, T., Mangsor, K. N. A., Othman, A. S., Rosazlina, R., Siow, J. & Ørgaard, Marian, 2020, In: Aroideana. 43, 1&2, p. 255-284 30 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  10. Published

    Über die kultur von Barclaya-Arten (Nymphaeaceae)

    Jacobsen, Niels, Ipor, I. B. & Bogner, J. (Translator), 2007, In: Aqua Planta. 32, p. 86-93 8 p.

    Research output: Contribution to journal › Journal article › Communication

  11. Published

    Cryptocoryne crispatula Engler var. flaccidifolia N. Jacobsen im südlichen Thailand

    Jacobsen, Niels & Soochaloem, D., 2006, In: Aqua Planta. 31, 1, p. 16-23 8 p.

    Research output: Contribution to journal › Journal article › Communication

  12. Published

    A new calcicolous variety of Cryptocoryne nurii Furtado (Araceae) from Pahang, Peninsular Malaysia

    Jacobsen, Niels, Bastmeijer, J. D., Ganapathy, H. B., Mangsor, K. N. A., Mansor, M., Sofiman Othman, A., Rahman, S. N. A., Rosazlina, R. & Siow, J., 2015, In: Malayan Nature Journal. 65, 4, p. 230-239 10 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  13. Published

    Lagenandra keralensis und L. meeboldii

    Jacobsen, Niels, Bastmeijer, J. D., Wongso, S. & Ørgaard, Marian, 2019, In: Aqua Planta. 3, p. 84-91

    Research output: Contribution to journal › Journal article › Research

  14. Published

    Artificial hybrids in Cryptocoryne (Araceae). 2. Hybridization between species of the Malay Peninsula

    Jacobsen, Niels, Bastmeijer, J. D., Bin Othman, A. S., Sookchaloem, D. & Ørgaard, Marian, 2019, In: Aroideana. 42, 1, p. 107-137

    Research output: Contribution to journal › Journal article › Research › peer-review

  15. Published

    OnCryptocoryne cordata var. siamensis

    Jacobsen, Niels & Bastmeijer, J. D., 2014, In: The Aquatic Gardener. 27, 3, p. 29-39 11 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  16. Published

    Cryptocoryne ciliata var. bogneri - eine neue tetraploide Varietät aus Sarawak

    Jacobsen, Niels, Bastmeijer, J. D., Jensen, Karen Rysbjerg & Ørgaard, Marian, 2019, In: Aqua Planta. 2, p. 52-63 6 p.

    Research output: Contribution to journal › Journal article › Research

  17. Published

    Tha Pom Klong Song Nam - a wonderful locality for Cryptocoryne ciliata in south Thailand

    Jacobsen, Niels, 2006, In: Aquatic Gardener. 19, p. 30-38 9 p.

    Research output: Contribution to journal › Journal article › Communication

  18. Published

    Die Bestäubung der Gattung Cryptocoryne (Araceae)

    Jacobsen, Niels & Ørgaard, Marian, 2020, In: Aqua Planta. 45, 1, p. 4-19 16 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  19. Published

    In the memory of Josef Bogner

    Jacobsen, Niels, 2020, In: The IAS Newsletter. 42, 2, p. 5-6 2 p.

    Research output: Contribution to journal › Journal article › Research

  20. Published

    Hybrids and the Flora of Thailand revisited: hybridization in the South-East Asian genus Cryptocoryne (Araceae)

    Jacobsen, Niels, Bastmeijer, J. D., Bogner, J., Budianto, H., Ganapathy, H. B., Idei, T., Ipor, I. B., Komala, T., Othman, A. S., Rosazlina, R., Siow, J., Wongso, S. & Ørgaard, Marian, 2016, In: Thai Forest Bulletin (Botany). 44, 1, p. 53-73 21 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  21. Published

    Cryptocoryne crispatula (Araceae) in Thailand seen with the help of AFLP glasses

    Jacobsen, Niels, Bastmeijer, J., Christensen, C., Idei, T., Lange, Conny Bruun Asmussen, Orabi, J., Sookchaloem, D., Toneatto, F. & Ørgaard, Marian, 2017, Abstract of 17th Flora of Thailand Conference: Taxonomic knowledge and a sustainable future. p. 143 1 p.

    Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

  22. Published

    Über die Bestäubung von Ophrys speculum Link auf Mallorca

    Jacobsen, Niels & Rasmussen, Finn N., 1976, In: Orchidee. 27, p. 64-66 3 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  23. Published

    Cryptocoryne crispatula var. tonkinensis und var. kubotae

    Jacobsen, Niels, Bastmeijer, J. D., Ørgaard, Marian & Bogner, J. (Translator), 2017, In: Aqua Planta. 3, p. 90-102 13 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  24. Published

    Josef Bogner — and the genus Cryptocoryne

    Jacobsen, Niels, 2021, In: Aroideana. 44, 1, p. 82-109

    Research output: Contribution to journal › Journal article › Research › peer-review

  25. Published

    Cryptocoryne crispatula var. Tonkinensis and var. Kubotae

    Jacobsen, Niels, Bastmeijer, J. D. & Ørgaard, Marian, 2017, In: The Aquatic Gardener. 30, 4, p. 24-31 8 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  26. Published

    Jan Dirk Bastmeijer: (22 October 1943 – 18 February 2022)

    Jacobsen, Niels & Wongso, S., 2022, In: Aroideana. 45, 2, p. 444-470 27 p.

    Research output: Contribution to journal › Journal article › Research

  27. Published

    On the Diptera pollinators of Cryptocoryne (Araceae)

    Jacobsen, Niels & Ørgaard, Marian, 2018, In: Aroideana. 41, 2-3, p. 218-236

    Research output: Contribution to journal › Journal article › Research › peer-review

  28. Published

    GMO-afgrøder ikke den eneste løsning

    Jacobsen, Niels, Jacobsen, S. & Sørensen, Marten, 12 Jul 2010, In: Berlingske Tidende. p. 9

    Research output: Contribution to journal › Contribution to newspaper - Feature article › Communication

  29. Published

    The use of AFLP markers to elucidate relationships within Cryptocoryne (Araceae)

    Jacobsen, Niels, Bastmeijer, J., Christensen, C., Idei, T., Lange, Conny Bruun Asmussen, Orabi, J., Sookchaloem, D., Toneatto, F. & Ørgaard, Marian, 2015, In: Aroideana. 38E, 1, p. 186-193 8 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  30. Published

    Elements of the evolution in the genus Cryptocoryne (Araceae)

    Jacobsen, Niels, Lange, Conny Bruun Asmussen, Bastmeijer, J., Budianto, H., Idei, T., Ipor, I. B., Bin Othman, A. S., Sookchaloem, D., Wongso, S. & Ørgaard, Marian, 2008, Monocots IV: Abstracts. p. 32 1 p.

    Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

  31. Published

    A new tetraploid variety of Cryptocoryne ciliata (Araceae) from Sarawak

    Jacobsen, Niels, Bastmeijer, J. D., Jensen, Karen Rysbjerg & Ørgaard, Marian, 2018, In: Willdenowia. 48, 3, p. 425-432

    Research output: Contribution to journal › Journal article › Research › peer-review

  32. Published

    Neue Veröffentlichungen über Cryptocoryne-Hybriden aus dem Süden West-Malaysias

    Jacobsen, Niels & Muth, H. (Translator), 2021, In: Aqua Planta. 1, p. 13-19 7 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  33. Published

    Cryptocoryne ×batangkayanensis (Araceae) und Bemerkungen zu einigen anderen Hybriden

    Jacobsen, Niels, Bastmeijer, J. D., Ipor, I., Jensen, Karen Rysbjerg, Wongso, S. & Ørgaard, Marian, 2016, In: Aqua Planta. 2, p. 54-66 13 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  34. Published

    Udvidet systematisk botanik bind 4: DICOTYLEDONEAE, Tokimbladede: CORNIFLORAE@2013LAMIIFLORAE @2013 KVL

    Jensen, J. & Jacobsen, Niels, 2003, 117 p.

    Research output: Book/Report › Book › Education

  35. Published

    Udvidet systematisk botanik bind 2: DICOTYLEDONEAE, Tokimbladede: THEIFLORAE@2013SANTALIFLORAE @2013 KVL

    Jensen, J. & Jacobsen, Niels, 2003, 132 p.

    Research output: Book/Report › Book › Education

  36. Published

    Udvidet systematisk botanik bind 3: DICOTYLEDONEAE, Tokimbladede: ARALIIFLORAE@2013SOLANIFLORAE @2013 KVL

    Jensen, J. & Jacobsen, Niels, 2003, 90 p.

    Research output: Book/Report › Book › Education

  37. Published

    Udvidet systematisk botanik bind 5: MONOCOTYLEDONEAE, Enkimbladede @2013 KVL

    Jensen, J. & Jacobsen, Niels, 2003, 148 p.

    Research output: Book/Report › Book › Education

  38. Published

    Udvidet systematisk botanik bind 1: MAGNOLIFLORAE@2013VIOLIFLORAE

    Jensen, J. & Jacobsen, Niels, 2003, 128 p.

    Research output: Book/Report › Book › Education

  39. Published

    Liljer som have- og potteplanter

    Kristiansen, K. M., Ørgaard, Marian & Jacobsen, Niels, 2000, In: Groen Viden, Havebrug. 128, p. 1-8 8 p.

    Research output: Contribution to journal › Journal article › Communication

  40. Published

    Water-Trumpet (Cryptocoryne): Conservation Action Plan 2023-2033

    Lansdown, R. V., Jacobsen, Niels, Kasselmann, C., Naive, M. A. K., Velautham, E., Watve, A., Wongso, S. & Yakandawala, D., 2023, IUCN SSC Freshwater Plant Specialist Group. 161 p.

    Research output: Book/Report › Report › Research

  41. Published

    Karyotype differentiation and evolution in the genus Hordeum (Poaceae)

    Linde-Laursen, I., Bothmer, R. V. & Jacobsen, Niels, 1995, Ikke angivet. Brandham, P. E. A. B. M. D. (ed.). Royal Botanic Gardens, p. 233-247 15 p.

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

  42. Published

    Cryptocoryne esquerionii (Araceae), a remarkable new species discovered by a citizen scientist in Zamboanga Peninsula, southwestern Philippines

    Mark, A. K. N., Reagan, J. T. V., Wongso, S. & Jacobsen, Niels, 2023, In: Nordic Journal of Botany. 2023, 3

    Research output: Contribution to journal › Journal article › Research › peer-review

  43. Published

    Discovery through citizen science: Cryptocoryne paglaterasiana (Araceae), a new endangered species from Tampilisan, Zamboanga del Norte, Western Mindanao

    Naive, M. A. K., Lagud, Y. J. & Jacobsen, Niels, 2022, In: Taiwania. 67, 4, p. 539-543 5 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  44. Published

    On the identity of Cryptocoryne pygmaea (Araceae) from Western Mindanao and the description of a new species from the islands of Palawan and Busuanga

    Naive, M. A. K., Bastmeijer, J. D. & Jacobsen, Niels, 2022, In: Phytotaxa. 572, 3, p. 295-300 6 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  45. Published

    Discovery through citizen science II: Cryptocoryne vinzelii (Araceae), a new species of water trumpet from Basilan Island, Philippines

    Naive, M. A. K., Duhaylungsod, A. B. & Jacobsen, Niels, 2023, In: Taiwania. 68, 3, p. 294-297 4 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  46. Published

    Farvestoffer i krokus: blomsterfarvernes kemi hjælper med at belyse slægtskabet

    Nørbæk, R., Ørgaard, Marian & Jacobsen, Niels, 2002, In: Naturens Verden. 85, 6, p. 34-37 4 p.

    Research output: Contribution to journal › Journal article › Research

  47. Published

    Flower pigment composition of Crocus species and cultivars used for a chemotaxonomic investigation

    Nørbæk, R., Brandt, K., Kvist Nielsen, J., Ørgaard, Marian & Jacobsen, Niels, 2002, In: Biochemical Systematics and Ecology. 30, 8, p. 763-791 29 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  48. Published

    Cryptocoryne of peninsular Malaysia

    Othman, A. S., Jacobsen, Niels & Mansor, M., 2009, Penerbit Universiti Sains Malaysia. 102 p.

    Research output: Book/Report › Book › Research › peer-review

  49. Published

    Pogostémon helféri (Hook.f.) Press (Lamiaceae), eine neue Aquarienpflanze aus Thailand

    Prasartkul, A. & Jacobsen, Niels, 2004, In: Aqua Planta. 24, 4, p. 143-148 6 p.

    Research output: Contribution to journal › Journal article › Communication

  50. Published

    Flora i kridt

    Rasmussen, Hanne Nina, Jacobsen, Niels & Rasmussen, Finn N., 1978, Beretning og regnskab for selskabets 88. regnskabsår 1977, Ålborg Portland. Ålborg, p. 19-24 6 p.

    Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Commissioned

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