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Horticulturist, plantsman and garden writer.

Mycologist

Armstrong was a lecturer in Chemistry in London and researched agricultural chemistry.

http://www.britannica.com/EBchecked/topic/396049/Sir-Ferdinand-von-Mueller

Born Suffolk 1817, died Berkshire 1911
Joseph Hooker graduated MD from Glasgow University though a passion for botany had developed through attending his father’s (William Jackson Hooker) lectures from the age of 7. Inspired by Darwin’s voyage of the Beagle, he was appointed assistant surgeon and then expedition’s botanist aboard the HMS Erebus in 1839 which spent 4 years exploring the southern oceans. Returning to England he worked on ‘The Botany of the Antarctic Voyages ‘plates, the book eventually being published in 6 volumes in the 1840s and 1850s. He was asked by Darwin to assist in classifying plants Darwin had gathered in the Galapagos; this was the start of a lifelong correspondence and friendship. Hooker acted as a sounding board and later research collaborator for Darwin’s emerging thinking on natural selection. Hooker’s central interest was in the geographical distribution of plants and how species migrated. This had practical applications in the search for new plants and transplanting crops between British colonies for economic exploitation. In 1845 he failed to be appointed professor of botany at Edinburgh University but the following year was appointed botanist to the Geological Survey which led to valuable series of papers. Between 1847 and 1851 Hooker travelled to Sikkim, India and Nepal, collecting 7,000 species including 25 new rhododendrons. In 1855 was appointed assistant director at Kew, under his father William Hooker. He succeeded his father as Director in 1865, by which time he was a highly regarded botanist with an international reputation. He remained Director at Kew until his retirement in 1885. These 20 years saw the expansion of Kew’s imperial role e.g. in facilitating the transfer of cinchona from South America to India and rubber from Brazil to several British colonies. Hooker strove to maintain Kew’s scientific reputation by limiting public access and resisting proposals to transfer Kew’s herbaria to the Natural History Museum. A prolific author, he was elected president of the Royal Society in 1873 and was highly regarded in his lifetime, receiving numerous honours, honorary degrees and prizes.
Sources: Dictionary of National Biography; R. Desmond ‘Dictionary of British and Irish Botanists and Horticulturalists; Journal of Botany 1912
D.W.

Born Derbyshire 1907; died Edinburgh 1978
Harold Fletcher graduated in botany from Manchester University in 1929, and obtained a doctorate from Aberdeen University in 1933 where he lectured in botany. In 1934 he moved to the Royal Botanic Garden Edinburgh, continuing work on the taxonomy of Asiatic floras and gaining a DSc from Edinburgh University in 1939. Jointly with William Wright Smith he authored a key monograph on the genus primula, his other specialism being rhododendrons. Turning his attention to horticulture, he was appointed Director of the RHS Garden at Wisley in 1951 before returning to Edinburgh in 1954 as assistant Keeper at the Royal Botanic Garden Edinburgh and then Regius Keeper in 1956 (the point at which the posts of Regius Keeper and Regius Professor of the University were no longer held by one person). He energetically set about rejuvenating botany and horticulture in the Garden and oversaw a number of major developments including the refurbishment of Inverleith House as an art gallery, a purpose build Herbarium and Library which opened 1964, a new range of glasshouses, and the acquisition of the Logan Estate in Wigtownshire as a subtropical garden. He stimulated the post war revival of the Botanical Society of Edinburgh and was President of the International Association of Botanical Gardens 1964-69, having brought the Tenth International Botanical Congress to Edinburgh in 1964. Fletcher was appointed Queen’s Botanist in Scotland in 1967 and Honorary Professor of Botany at Edinburgh University in 1968. With W.H. Brown, he wrote the ‘History of the Royal Botanic Garden, Edinburgh 1670-1970’ and also authored books on the history of the RHS and plant explorers. Fletcher had a deep love of the arts and after his retirement in 1970 served on the board of the Edinburgh College of Art.
Sources: R. Desmond ‘Dictionary of British and Irish Botanists and Horticulturalists; HR Fletcher and WH Brown ‘The Royal Botanic Garden Edinburgh 1670-1970’; Deni Bown, ‘4 Gardens in One’.
D.W.