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Carl Frederik Albert Christensen (1872–1942) was a Danish systematic botanist. He graduated in natural history from the University of Copenhagen under professor Eugenius Warming. He was first school teacher in Copenhagen, 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.