[[File:CAJAOudemans186X.jpg|thumb|Portrait of C. A. J. A. Oudemans, ca. 1869]]

'''Corneille Antoine Jean Abram Oudemans''' or '''Cornelis Antoon Jan Abraham Oudemans''' (7 December 1825 – 29 August 1906) was a Dutch botanist and physician who specialized in fungal systematics.

Oudemans was born in Amsterdam, the oldest of seven children of his namesake teacher father and Jacoba Adriana Hammecker. A younger brother, [[Jean Abraham Chrétien Oudemans|Jean Abraham Chrétien]] became an astronomer and a nephew, [[Anthonie Cornelis Oudemans|Anthonie Cornelis]], became a zoologist. Oudemans went to school in [[Weltevreden (Batavia)|Weltevreden]], Java, where his father taught and moved back to Amsterdam for classical studies. He then went to the University of Leiden where he received a medical degree in 1847. He travelled to Europe but he had to return due to the [[March Revolution (Denmark)|March Revolution]]. He became a lecturer in ''[[materia medica]]'' at Rotterdam where he also practiced medicine. He went to teach medicine at the Athenaeum of Amsterdam in 1859 and when it became a university in 1877 he was made [[Rector (academia)|rector magnificus]]. He became interested in the fungi and began to catalogue and describe them in Révision des champignons (1892–1897) and Catalogue raisonné (1904). Oudemans distributed two [[exsiccata]]-like series ''Herbarium Nederlandsche planten door C. A. J. A. Oudemans'' and ''Fungi Neerlandici exsiccati a C. A. J. A. Oudemans collecti''.<ref>{{cite web |title=Herbarium Nederlandsche planten door C. A. J. A. Oudemans: IndExs ExsiccataID=257946074 |website=IndExs – Index of Exsiccatae |publisher=Botanische Staatssammlung München |url=https://www.botanischestaatssammlung.de/DatabaseClients/IndExs/Exsiccatae_IndExs_Details.jsp?ExsiccataID=257946074 |access-date=28 August 2024}}</ref><ref>{{cite web |title=Fungi Neerlandici exsiccati a C. A. J. A. Oudemans collecti: IndExs ExsiccataID=194301069 |website=IndExs – Index of Exsiccatae |publisher=Botanische Staatssammlung München |url=https://www.botanischestaatssammlung.de/DatabaseClients/IndExs/Exsiccatae_IndExs_Details.jsp?ExsiccataID=194301069 |access-date=28 August 2024}}</ref><ref name="Triebel & Scholz 2001-2024">Triebel, D. & Scholz, P. 2001–2024 ''IndExs – Index of Exsiccatae''. Botanische Staatssammlung München: http://indexs.botanischestaatssammlung.de. – München, Germany.</ref> He retired in 1896 but continued to describe the European parasitic fungi which was published posthumously as ''Enumeratio systematica fungorum'' by professor [[Jan Willem Moll|J. W. Moll]] of Groningen University.<ref>{{cite journal| url= https://www.biodiversitylibrary.org/page/43350696 | title=C.A.J.A. Oudemans| author=Moll, J.W.| journal= Berichte der Deutschen Botanischen Gesellschaft |volume=26a| pages= 12-33| year= 1908 |lang=de }}</ref>

 

 

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