David Thoday FRS (5 May 1883 – 30 March 1964) was a botanist.
Career Thoday was Harry Bolus professor of botany, University of Cape Town and later professor at the University College of North Wales 1923–1949. As a botanist, his work is denoted by the author abbreviation Thoday when citing a botanical name.
Awards and honours He was elected a Fellow of the Royal Society in 1942. His nomination reads
Personal life He married fellow botanist and activist Mary Gladys Sykes in 1910. Their son was the geneticist John Thoday.
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