Lord Francis Douglas Marquess of Queensberry; a younger brother, Lord Archibald Edward Douglas (1850–1938), who became a clergyman; and a younger brother and sister, the twins Lord James Douglas (d. 1891) and Lady Florence Douglas (1855–1905), who married Sir Alexander Beaumont Churchill Dixie, 11th Baronet. He was an uncle of Oscar Wilde's lover Lord Alfred Douglas, and a younger brother of John Douglas, 9th Marquess of Queensberry. In 1858, Douglas's father, Lord Queensberry, died in what was reported as a shooting accident, but his death was widely believed to have been suicide. In 1862, his mother, Lady Queensberry, converted to Roman Catholicism and
Alfred Douglas Hardy named "Debarya hardyi" in Hardy's honour. Also in 1909, the Melbourne & Metropolitan Board of Works appointed him "honorary algologist", a position that he held for the rest of his life. His position required him to provide reports listing the algae species found in the various reservoirs managed by the Board of Works. In addition to these unpublished reports, Hardy publishedat least 14 papers of the freshwater algae of Victoria, mostly in the "Victorian Naturalist". Alfred Douglas Hardy Alfred Douglas Hardy (1870 – 1958) was an Australian amateur collector of freshwater algae specimens. He worked as a draftsman and botanical