Carl Frederik Albert Christensen
Carl Frederik Albert Christensen 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.- Christensen, Carl Index Filicum. 744 s. Index Filicum Supplementum I-III. Reprint 1973 by Koeltz Antiquariat.
- Christensen, Carl Den danske botaniks historie med tilhørende Bibliografi. København, H. Hagerups Forlag. Three vols. 680 s.
