SDCPs, here are 2 posts by NaN that were helpful to me:
http://terraforums.com/forums/showpost.php?p=989560&postcount=10
and
http://terraforums.com/forums/showpost.php?p=989606&postcount=12
The honeycomb seed diagnosis will work well for you, since you usually have plenty of seeds on hand
.
It's from this thread:
http://terraforums.com/forums/showthread.php?t=124191&highlight=dielsiana
There are actually a lot of different D. natalensis forms that behave very differently.
I traded 2 people for D. dielsiana, and they both turned out to be the same form of D. natalensis...
But it can be a lot harder to judge, since it appeared like massmorrel's dielsiana was actually the real deal, since its crown/the back of the leaf lamina wasn't pillose.