Jakob Emanuel Lange

Jakob Emanuel Lange (2 April 1864 – 27 December 1941), was a Danish mycologist who studied the systematics of gilled mushrooms. His best-known work is Flora Agaricina Danica, a five-volume plate work on the Agaricales of Denmark. He was also a dedicated Georgist land reformer.

He was the father of Morten Lange (1919–2003), mycologist, professor at the University of Copenhagen and member of the Folketing.