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)
-PM