Aridarum crassum S.Y. Wong & P.C. Boyce is described as a new species from Sarawak,
Malaysian Borneo. The existing key to the genus Aridarum Ridl. is amended to include the
new species.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith