Frederik Marcus Knuth, 9th Count of Knuthenborg was a Danish taxonomist especially known for the collection and classification of cactuses. He collected and described many new species.
According to the Bovrup File Knuth was a member of DNSAP. Wikipedia
Born: May 5, 1904, Hunseby Parish
Died: June 14, 1970 (age 66 years)
Children: Adam Wilhelm Knuth
Grandchildren: Marcus Knuth, Adam Christoffer Knuth, Gisela Tatiana Knuth, and more
Grandparents: Louis Pio, Louise Augusta Henrietta Jørgensen, and Adam Wilhelm Knuth
Parents: Eggert Knuth and Sylvia Pio
Spouse: Christa Theodora Marie Nanna Lund (m. 1925–1948)