Career
Born in Hanover in 1836, he was chosen by William Jackson Hooker, Director of the Royal Botanic Gardens, Kew, to take part in William Balfour Baikie"s expedition to West Africa. While there, he sent numerous specimens back to Kew. His exploration of the Cameroon Mountains is described by Sir Richard Burton in Abeokuta and the Camaroon Mountains volunteer
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Mann later collected specimens in Darjeeling, India, before retiring to Munich, Germany, in 1891.
He died in 1916
Some 349 species of plants, the genera Manniella Hook.f. and Manniophyton Muell. Arg.; and Mann"s Spring on the Cameroon Mountain bear his name.