I have a B. lobbii mounted on cork, does very well. I was told there are 65 recognised varieties of lobbii, and then if you add on the varieties of claptonense (so similar), and then think that whatever figure that achieves, that is just 2 species from a genus of 2,000 or so, the mind boggles at the huge diversity in this genus..! I love the Bulbos, so wonderful, and so often so unexpected!