Differences between b.phalaenopsis, b.fletcherianum, b.macrobulbum when not in bloom?

[Sinisteorchids]

How can I tell b. phalaenopsis, b. fletcherianum, and b. macrobulbum apart if they are not in bloom? What intricate details can I look for in the differences between their pseudobulbs or leaves? I have looked through as much photos and information as I could possibly find and I'm still having trouble telling them apart without flowers. I'm in the process of acquiring all three. I have purchased b. phalaenopsis and b. fletcherianum. The difference I could tell between these two at the moment is that b. fletcherianum seems to have a more purplish hue on it's pseudobulbs but sometimes in different specimens they end up looking the same. Mislabelings and some sellers who have mixed idea what they have is the problem, are there any details I could look for to be of certain?