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Index filicum,sive, Enumeratio omnium generum specierumque filicum et Hydropteridum ab anno 1753 ad finem anni 1905 descriptorium : adjectis synonymis principalibus, area geographica, etc. /Carl Christensen.
By: Christensen, Carl, - Christensen, Carl, - Jarrett, F. M. - Pichi-Sermolli, Rodolfo E. G. - International Association for Plant Taxonomy
Publication info: Hafniae [Copenhagen] :H. Hagerup,1906.
Contributed by: Missouri Botanical Garden, Peter H. Raven Library
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A monograph of the genus Dryopteris / by Carl Christensen.
By: Christensen, Carl,
Publication info: København :B. Lunos bogtr.,[1912-1919 [i.e. 1913-1920]
Contributed by: Mertz Library, The New York Botanical Garden
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Revised list of Hawaiian Pteridophyta,
By: Christensen, Carl,
Publication info: Honolulu, Hawaii,The Museum,1925.
Contributed by: University of Michigan (archive.org)
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