Elizabeth "Elsie" Marianne Blackwell FLS (8 January 1889 – 25 May 1973) was an English botanist and mycologist, known as an expert on Phytophthora.
[1] Blackwell completed her secondary education at Southport High School for Girls.
[1][3] In October 1920 she was granted an academic leave of absence to study with J. Bretland Farmer at the Huxley Laboratory for Biological Research at Imperial College London, where she began her study of Phytophthora.
She also established friendships with Annie Lorrain Smith, Gulielma Lister, Arthur Anselm Pearson, and other noteworthy mycologists.
After two terms, Blackwell was recalled to the University of Liverpool, but she did continue her studies at Imperial College London in the summers of 1921 and 1922.