I find coelogyne bulbs can be pretty surprisingly spherical.
What are the leaves like?
Where is the spike coming from?
You can upload some pictures to flickr or picasa or something like that and then share a link to them here.
---------- Post added at 05:11 PM ---------- Previous post was at 05:03 PM ----------
Maxillarias can also have roundish quite flattened pbulbs, come to think of it.
---------- Post added at 05:33 PM ---------- Previous post was at 05:11 PM ----------
miltonias and miltoniopsis are also somewhat round and flattened) although "spherical" is not something I'd really call them.
---------- Post added at 05:37 PM ---------- Previous post was at 05:33 PM ----------
I've also seen some Polystachya with rounded pbulbs (
P. ottoniana in the wild)