Birger Kajanus dating history

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Birger Kajanus (born Birger Nilsson; 20 November 1882 – 5 August 1931) was a Swedish botanist, geneticist, plant breeder and lichenologist. As a young student at Lund University he published pioneering work on lichens, proposing a new theory of soredia and isidia formation, and participated in early lichenological exploration of the Sarek mountains in northern Sweden. He later became a leading figure at the plant-breeding station Weibullsholm near Landskrona, where he carried out extensive Mendelian studies on beetroot, poppy and wheat and bred several successful crop varieties, notably the wheat cultivar Standard. In the mid-1920s he emigrated to Egypt to work as a cotton breeder, and he spent his final years there.