Unfortunately, what I've learned from serious Bulbophyllum growers and vendors in the US & Canada is that Siegriest's book is full of errors, and you cannot trust it for IDing plants. Worse, there's no definitive source right now to go to.
Wow, those are some fascinating photos. With my current Phrag, Tolumnia, Pluero. addictions I am sure I will never try to grow any of these but still fascinating.