Per Karl Hjalmar Dusén

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Per Karl Hjalmar Dusén (1855–1926) was a Swedish civil engineer, botanist and explorer. He studied ferns (pteridology), mosses (bryology) and fossil plants (paleobotany). He conducted botanical expeditions to Africa, Greenland and South America. On Disko Island in Greenland he catalogued flowering plants, horsetails and ferns. Between 1890 and 1892 he collected about 560 leaf fossils preserved in basalt near Mount Cameroon on the west coast of Cameroon; German paleobotanist Paul J. Menzel later studied these fossils. Dusén edited three bryophyte exsiccatae, including Musci Africani in Camerunia a P. Dusén collecti (1893) and Hepaticae Africanae in Camerunia a P. Dusén collectae. His botanical specimens are at the New York Botanical Garden, which acquired them when it took over Princeton University’s herbarium in 1945. More than 200 species have been named in his honour, and Dusén Fjord in northeastern Greenland is named after him.