The American ferns of the group of Dryopteris opposita contained in the U.S. National Museum
By: by Carl Christensen.
Contributors: United States National Museum.
Series: Smithsonian miscellaneous collections -- v. 52, art. 25; Publication -- 1867; Publication (Smithsonian Institution) -- 1867.
Publisher: Smithsonian Institution
Published: 1910
Place of publication: Washington
Language: eng
Number of pages: 396
Subjects: Dryopteris.; Ferns -- America.
Notes: Reprint. Originally published July 12, 1909.