[kmarch]

For what its worth your orchid is some type of oncidium alliance plant, not a cattleya. But I'm afraid your pseudobulb won't root dtje, it's been improperly divided, cut off from the rhizome, and so the part that would grow roots and a new growth are missing. It won't grow roots and a new growth for you.

abneofelis, roots don't grow from between the bulb and the leaves, they grow from the base of the bulb.