The Austrian naturalist and explorer Andreas Reischek named New Zealand's westernmost lake in Fiordland (45°59'14.3"S 166°30'09.8"E) after Thomas in 1887.A. Reischeck, ′Recent explorations north of Chalky Sound, West Coast of Otago′,Transactions and Proceedings of the New Zealand Institute, vol. 20 (1887), p. 441. See: http://rsnz.natlib.govt.nz/volume/rsnz_20/rsnz_20_00_006830.html Following his death, the executors of his estate gifted 100 acres (42 hectares) of land at Piha to the Auckland City Council; this was supplemented in 1963 by the gift of Lion Rock (Te Piha), an eroded 16-million-year-old volcanic neck, that was acquired by two of his sons, Acland and Norman, from Te Kawerau in 1941. These gifts were commemorated in 2008 with the naming of a part of the gift as the Sir Algernon Thomas Green. In 1968, largely on the initiative of Sir Douglas Robb, chancellor of the University of Auckland, the university's new biological sciences building was named in his honour. Following the subdivision of his garden, a road formed through the property (primarily through what had been his 'cow paddock') was named Withiel Drive in his memory, as was a reserve donated to the Auckland City Council in 1949 by his son Norman, which was based on a remnant of the Maungawhau lava field that he had preserved, Withiel Thomas Park.
