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Douglas Houghton Campbell (born Dec. 16, 1859, Detroit, Mich., U.S.—died Feb. 24, 1953, Palo Alto, Calif.) was an American botanist known for his research concerning modes of sexual reproduction in mosses and ferns. His work intensified a controversy surrounding the evolutionary origin of the Tracheophyta (vascular plants). A professor of botany at Indiana University, Bloomington (1888–91), Campbell moved to the newly founded Stanford University, Palo Alto (1891–1925), where he organized and directed the department of...