Here's Dendrobium gracilicaule, now known as Thelychiton gracilicaulis... this is native to Eastern Australia and New Caledonia, at very low elevations.
The segregate genus Thelychiton includes Thely. kingianus (Den. kingianum) and Thely. speciosus (Den. speciosum), just to name a couple.
Dendrobium gracilicaule (click picture to enlarge)