約瑟夫·道爾頓·胡克 Sir Joseph Dalton Hooker 1817-1911
由 Henry Joseph Whitlock - http://www.npg.org.uk/collections/search/portraitLarge/mw114514/Sir-Joseph-Dalton-Hooker?LinkID=mp02262&search=sas&sText=Joseph+Dalton+Hooker&role=sit&rNo=5, 公有領域, https://commons.wikimedia.org/w/index.php?curid=15393893