Olaf Hagerup

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Olaf Hagerup (September 29, 1889 - March 2, 1961) was a Danish botanist. He studied botany at the University of Copenhagen from 1911 under the professors Eugenius Warming, Christen C. Raunkiær, L. Kolderup Rosenvinge og W. Johannsen. He took his Ph.D. from the same university in 1930. From 1934 to 1960, he was superintendent at the Botanical Museum of the University of Copenhagen.

Hagerup’s scientic works concern evolution, polyploidy and pollination, among other things. He showed that the tetraploid Empetrum hermaphroditum is a separate species from the diploid Empetrum nigrum. He thereby initiated the use of chromosome numbers in systematic botany, a field later known as cytotaxonomy. He put forward the hypothesis that the ploidy level is an important factor in the distribution and ecology of plant species. In contrast, another of his scientific ideas has been disproven by later modern research – the idea of a direct ancestry of the centrosperms (approximately equal to Caryophyllales) from the gymnospermous Gnetophyta and, hence, two separate evolutionary lineages within the flowering plants. Many of Hagerup’s study were concerned with plant species of the Ericaceae, Empetraceae and related families, or ’’Bicornes’’ as they were know in the Wettstein system.

The standard author abbreviation Hagerup is used to indicate this individual as the author when citing a botanical name.[1]

[edit] Scientific works

  • Hagerup, O. (1926) Kønsdelenes Bygning og Udvikling hos Koenigia islandica L. (The anatomy and development of sexual structures in Koenigia islandica L.) Meddelelser om Grønland 58 (3): 197-204.
  • Hagerup, O. (1928) Morphological and cytological studies of Bicornes. Dansk Botanisk Arkiv 6 (1): 1-27.
  • Hagerup, O. (1930) Über die Bedeutung der Schirmform der Krone von Acacia seyal Del. Dansk Botanisk Arkiv 6 (4): 1-20.
  • Hagerup, O. (1930) Vergleichende Morphologische und Systematische Studien über die Ranken und Andre Vegetative Organe der Cucurbitaceen und Pasifloraceen. Doctoral dissertation, University of Copenhagen. Dansk Botanisk Arkiv 6 (8): 1-104.
  • Hagerup, O. (1932) Über Polyploidie in Beziehung zu klima, Ökologie und Phylogenie. Hereditas 16: 19-40.
  • Hagerup, O. (1938) A peculiar asymmetrical mitosis in the microspore of Orchis. Hereditas 24: 94-96.
  • Hagerup, O. (1941) Zytoökologische Bicornes-Studien. Planta 32: 6-14.
  • Hagerup, O. (1944) Basidiens cytologi hos Tremellodon gelatinosum (Scop.) Pers. (Cytology of the basidia by Tremellodon gelatinosum (Scop.) Pers). Friesia 3: 46-51.
  • Hagerup, O. (1945) Basidiens cytologi hos Lepiota (Limacella) lenticularis Lasch (Cytology of the basidia by Lepiota (Limacella) lenticularis Lasch). Friesia 3: 96-100.
  • Hagerup, O. (1952) Bud autogamy in some northern orchids. Phytomorphology 2: 51-61.
  • Hagerup, O. (1952) The morphology and biology of some primitive orchid flowers. Phytomorphology 2: 134-138.
  • Hagerup, O. (1953) Autogami hos Chamaeorchis. Blyttia 11: 1-5.
  • Hagerup, O. (1953) The morphology and systematics of the leaves in Ericales. Phytomorphology 3: 459-464.
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