Johannes von Hanstein
Deceased Person
1822 – 1880
Who was Johannes von Hanstein?
Johannes Ludwig Emil Robert von Hanstein was a German botanist who was a native of Potsdam.
He attended classes at the Gärtnerlehranstalt in Potsdam, and later studied sciences in Berlin, attaining his doctorate in 1848. In 1855 he was a lecturer of botany at the University of Berlin, and six years later became curator of the royal herbarium. In 1865 he was appointed professor of botany at the University of Bonn and director of the botanical garden.
Hanstein is remembered for studies in plant anatomy and morphology. In 1868 he introduced the "histogen theory" to explain shoot apex behaviour in plants. With his close friend, Nathanael Pringsheim, he conducted pioneer research involving the fertilization process in ferns.
The plant genus Hansteinia of the family Acanthaceae is named after him.
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