German botanist; born at Berlin Feb. 29, 1844; educated at the Werdergymnasium and the university of his native city and at the University of Freiburg-im-Breisgau (Ph.D. Berlin, 1870). He became in 1875 privatdocent at his alma mater, where since 1880 he has occupied the position of assistant professor of botany. He was a member for botany of the Prussian commission for the exploration of the seas, and as such took part in the expeditions of 1871 in the Baltic Sea, of 1872 in the North Sea, and of 1874 on The Sley. He made reports of these expeditions, which were published by the government. Magnus contributed articles on botany to various scientific journals, and is the author of: "Beiträge zur Kenntniss der Gattung Najas," 1870; "Morphologie der Sphacelaricen," 1873; "Pilze des Kantons Graubündten," 1890.

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