A New Species of Stigmatodactylus (Orchidaceae) from West Papua Province, Indonesia, and the Rediscovery and Reinterpretation of S. gibbsiae

Two species of <i>Stigmatodactylus</i> have recently been observed in the Arfak Mountains of West Papua Province, Indonesian New Guinea. One of these is clearly undescribed and is here described as <i>Stigmatodactylus antennatus</i> Schuit., Saputra & Wanma, a species uniquely characterised by the presence of a pair of antennae on the lip. The other is believed to be <i>S. gibbsiae</i> (Kores) Kores. This species was only known from the type material collected in the Arfak Mountains more than a century ago, in 1913. There are, however, significant discrepancies between the protologue and the material recently found. We interpret these discrepancies as misinterpretations of the poor type material of <i>S. gibbsiae</i>, and provide images based on fresh material. An identification key to the four species of <i>Stigmatodactylus</i> in New Guinea is included.