Abstract
A new species of the mycoheterotrophic genus Thismia Griff. (Thismiaceae), Thismiasumatrana Suetsugu & Tsukaya, from West Sumatra, Indonesia, is described, based on a rehydrated herbarium specimen from National Museum of Nature and Science, Japan. Thismiasumatrana is closely related to T.clavigera (Becc.) F.Muell. but is distinguished by a much larger flower.