Hello!
You can post questions in the beginner's forum.
But...
I can tell you right now, your Dockrilla striolata and Dendrobium kingianum are both lithophytes (they grow on rocks).
Dockrilla striolata grows on granite. Not sure what kind of rocks Dendrobium kingianum grow on in the wild, but I grow mine in diatomite.
Dockrilla striolata in the wilds of Oz

:
http://www.flickr.com/photos/tony_ro...n/photostream/