Danish botanist. Johan Lange worked as a teacher in Copenhagen between 1842 and 1848 before he became librarian at the Copenhagen Botanical Garden in 1951. While he only remained in this role until 1858, Lange served as a part time director of the botanical garden for 20 years beginning in 1856. Later he worked as a botany lecturer at the Royal Agricultural and Veterinary College (1858-1893) and from 1860 was also a professor of botany at the Danish Polytechnical University. Lange was awarded an honorary PhD by the University of Uppsala in 1977. Collecting extensively in Europe, he was also interested in the flora of Greenland and published his Conspectus florae Groenlandicae in three parts between 1880 and 1894. Lange was also involved in editing the later fascicles of the Flora danica and produced an index to this vast publication in the form of his Nomenclator "Florae danicae" (1887).

Source:
F.A. Stafleu and R.S. Cowan, 1976-1998, Taxonomic Literature, 2nd edition (TL-2): 2: 746.