Carl Frederik Albert Christensen (16 January 1872 – 24 November 1942) was a Danish systematic botanist. He graduated in natural history from the University of Copenhagen under professor Eugenius Warming. He was then a school teacher in Copenhagen, and later superintendent at the Botanical Museum. He was a specialist in ferns and published a catalogue of the World's Pteridophytes, Index Filicum. In addition, he authored a three-volume work on the history of botany in Denmark.

Selected scientific works

• Christensen, Carl (1905–06) Index Filicum. 744 s. Index Filicum Supplementum I-III (1913–17). Reprint 1973 by Koeltz Antiquariat.
• Christensen, Carl (1924-1926) Den danske botaniks historie med tilhørende Bibliografi. København, H. Hagerups Forlag. Three vols. 680 s.

References

• Pichi-Sermolli, R. (1946). "Carl Christensen in memoriam (1872–1942)". Nuovo Giornale Botanico Italiano. nueva serie. 53 (1–2).
• Benedict, R. C. (1912). "Carl Frederik Albert Christensen: Some Biographical Notes". American Fern Journal. 2 (2): 53–57. doi:10.2307/1544606.
• Asplund, E. (1945). "Carl Christensen". American Fern Journal. 35 (4): 131–132. JSTOR 1545652.

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[ru] Кристенсен, Карл