(Source: Flora Malesiana ser. 1, 1: Cyclopaedia of collectors)

(Source: Flora Malesiana ser. 1, 5: Cyclopaedia of collectors, Supplement I)

(Source: Flora Malesiana ser. 1, 8: Cyclopaedia of collectors, Supplement II)

Born: 1865, Odense, Fünen, Denmark. Died: 1948, Copenhagen, Denmark.

career:

Botanist, educated at Copenhagen; employed in the Laboratory for Plant Physiology at Copenhagen (1890-97), and at the Experiment Station for Agriculture at Karlsruhe (1898-1900); Botanist for tobacco research in the Botanic Gardens at Buitenzorg, 1900-12; Director of the Experiment Station for ‘Vorstenlanden’ Tobacco (Klaten, later Wedi, Centr. Java), 1912-18; Head of the Laboratory for Microbiology at Buitenzorg in 1918; in 1919 back to Europe and in 1923 appointed University Lecturer in Microbiology at Copenhagen. In 1922 he was attached to a Danish expedition to the Moluccas (see below), conducted by Dr Th. Mortensen (see there); he was assisted by mantri Iboet of the Botanic Gardens, Buitenzorg. From 1933-36 besides Professor of Plant Physiology at the Veterinary and Agricultural College at Copenhagen.

Author of agricultural, microbiological and botanical papers.¹

Eria jenseniana J.J.Sm. is named after him.

Collecting localities:

1900. W. Java, W. Java: G. Gedeh (before 1910); Depok (Dec. 9).- Centr. Java: Nusa Kembangan (19. .).-Localities taken from his dupl. labels of the Mortensen Expedition: 1922. W. Java: Hort. Bot. Bog. (Jan. 16-18, nos 1-18); Staying in Ambon (Febr. 8-March 14; for some days in the Bay of Saparoea) and the Kei (= Kai) Islands (March 17-May 23); evidently paying a visit to the Aru islands; after the sojourn in the Kai Islands, Jensen returned to Java: Ambon: Gelala (Feb. 22-March 3); Saparoea (March 3-10); Key (= Kai) Islands: Toeal (Klein Key) (17-26); Groot Key: G. Daäg (Apr. 2-6), Elat (9-10); Klein Key: Toeal (12-15); Aru Islands: Dobo (18-20), Sg. Workai (21), Papakula (22), Manumbai (23); ? Klein Key: facing Toeal (29), Ohoitiel (May 2-3); Groot Key: W. Elat (8), Jamtil (9); Klein Key: Toeal (11), Godan (12), Ohoidir (13-16), Langoer and Gelanit (16), Toeal (18); Centr. Java: pasar (= market) at Wedi (near Klaten), herbs! (June); ditto from the Pharmacological Museum at Buitenzorg and Pasar Bogor (19-24); Hort. Bot. Bog. (June 26, July 5), Kultuurtuin (July 3).

collections:

Herb. Copenhagen [C]: extensive collections of W., Centr., and E. Java (coll. 1900-12), partly herbarium, partly dried parts of plants, and material in alcohol (especially rich). Some orchids from Java collected for J.J. Smith, in Herb. Bog. [BO]. Plants of the Kai expedition in Herb. Copenh. [C]: 479 nos; 2nd set in Herb. Bog. [BO], 3rd in Herb. Leiden [L], The collection contains many Algae.²

From the Kai Expedition nos 19-260 (cryptogams) and 2-416 (s or h) (phanerogams). He collected many fl. and fr. in alcohol.

Some living plants from the Mortensen Expedition in Hort. Bog.

literature:

(1) E.g.: ‘Een knopdannelse paa Hypokotylen hos Jatropha curcas’ (Biol. Arbejder tilegn. Eug. Warming 1911, p. 123-125, 3 fig.); ‘Viviparie bij Phalaenopsis amabilis’ (Trop. Nat. 4, 1915, p. 40-43, 2 fig.).

(2) cf. A. Weber van Bosse in Vidensk. Medd. Dansk Naturh. Foren. Københ. 81, 1926, p. 57-155, 43 fig.

biographical data:

Teysmannia 29, 1918, p. i-xix, w. portr.; Meded. Proefstat. Vorstenl. Tabak no 38, 1918/19, p. 3, portr.; portr. in Christensen, Den Danske botanisks Historie 1, 1924-26, p. 853; portr. & bibliogr. in Christensen, Den Danske botaniske litteratur 1880-1911, 1913, p. 145-146, and l.c. 1912-1939, 1940, p. 32-34 - portr.; Backer, Verkl. Woordenb., 1936; Entom. Meddel. 15, 1936, p. 361-362, fig. 104, portr.; J. Sc. Res. 1, 1952, p. 228 (from Naturw. Rundschau); Årsskrift Kgl. Veter.-Landbohøjskole 1949, p. 205-210, with portr. and list of biogr. refer.; Dansk Bot. Arch. 21, 1963, p. 64-65, 167 (bibliogr.).

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