Thiselton-Dyer was a fellow of the University of London from 1887 to 1890, Royal Commissioner to the Paris International Exhibition (1900) and to the St. Louis Exposition (1904), botanical adviser to the Secretary of State for the Colonies (1902–1906), and became a member of the court of the University of Bristol in 1909. His principal works are an English edition of Sachs "Text-Book of Botany" (1875), editions of the "Flora Capensis" and of the "Flora of Tropical Africa", and "Index Kewensis" (1905).