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Simon Davis was a respected American amateur mycologist and field collector based in Brookline and Boston, Massachusetts, whose contributions significantly advanced the study of North American fungi in the early twentieth century. He played an active role in the formative years of the Boston Mycological Club, founded in 1895 and recognized as the oldest continuously operating amateur mycological society in the United States. Outside of his scientific pursuits, Davis maintained a professional office in Boston’s Penn Mutual Building.
Davis earned considerable recognition for his careful and prolific collecting efforts, which frequently supplied specialists with rare and previously undocumented specimens. Several newly identified fungi were named in his honour, including Hygrophorus davisii, a species described from a specimen he collected in Stow, Massachusetts, on August 29, 1905. His discoveries and collections were regularly shared with leading taxonomists of the period. Notably, the distinguished New York State Botanist Charles Horton Peck based his description of Russula ventricosipes entirely on material provided by Davis.
Through his meticulous documentation and preservation of specimens, spores, and field records, Davis became an important contributor to mycological research. His collections, particularly those representing the taxonomically challenging genera Russula and Lactarius, proved invaluable to later scientific investigations and were incorporated into major archival studies, including the specialized research of mycologist Gertrude Simmons Burlingham. His work helped strengthen the foundation of fungal taxonomy in North America and continues to be reflected in the scientific literature of the era.