Hi Misty,
I have an E. radiata, which is now recognized as Prosthechea radiata, FYI.
The one I have does grow more in a line than in a clump, although I get new p-bulbs growing from the old ones in more than one direction. The other thing about these is that the p-bulbs can sometimes look like they are growing on a short stalk at the base. I hope this helps!