Guy Richard Bisby (1889–1958) was an American Canadian mycologist and botanist in plant pathology.
He published around fifty books and papers in mycology that extensively contributed to the taxonomy and nomenclature of fungi.
He then worked as an assistant at the Brooklyn Botanic Garden in New York from 1913 to 1914, where he gained an interest in plant pathology.
[3] Mycology and plant pathology have a strong overlap due to rusts, pathogenic plant-killing fungal diseases.
Bisby took a year's long leave of absence in 1921–1922 to visit the Imperial Bureau of Mycology in Kew, England.
In 1931, he and co-author Edwin John Butler published The Fungi of India, partially based on samples collected while Bisby was on sabbatical there.
During his term in Winnipeg, Bisby (and Buller's team) had gathered several thousand fungi samples which were stored in the herbarium of the University of Manitoba.
Obituaries often noted that Bisby had a reputation as a hard worker who largely skipped conferences, committees, and meetings, eschewing administrative work to doggedly gather samples and write articles and books with his co-authors.