Lars, here is the description of Bulbo. wallichii flower from the book written by three scientists--"... nodding flowers usually with orange-red sepals and petals and purple-black lip; dorsal sepal lanceolate, 5mm long, 1.7mm broad, irregularly fimbriate-margined; lateral sepal 2.7-4cm long, connate along one side except in basal part, lanceolate, sparsely ciliate; petals obliquely ovate-deltoid, 3mm long, 1.5mm broad, irregularly fimbriate-margined; lip fleshy, ligulate, 3.5mm long, recurved. hinged at base to column-foot, mobile, slightly concave, barbate on the lower surface and margin; column 1.5mm long; column-foot 1.5mm long."... and Bulbo. wallichii is a bifoliate species.
I still can't find description/ref. on Bulbo. kanburiense from reliable sources.
Hopefully, Jim Cootes will see this thread and give us some thoughts about these species.