Well, real belly laughs here. At one time I held the UK National Collection of Paphs and had ( supposedly) examples of most species, including all of this group ; I even had a piece of the original P. chamberlainianum var chamberlainum, which came from the Chamberlain collection ( the guy concerned was part of the UK government - Foreign Secretary, more than a hundred years ago - had a collection housed in 32 different greenhouses, with a staff of goodness knows how many gardeners to look after them.).. which is all by the way.
The point is that I always puzzled over the differences ; I have sat with plants in flower and read the expert ( Phil Cribb) in his Kew monograph, as to the differences between the several species in the group , and found myself unable to decide whether I was looking at P.victoria -maria, liemanianum, glaucophyllum or whatever ; well, maybe I exaggerate a bit, some plants I was say 90% sure of the label, but a good many, well, the labels were just guesses. One of the Victoria -marias got an award at a World Orchid Conference ( with no quibble about the name ) , but I took the same plant to a British Paph.Society meeting - where all the UK experts gathered, and got 4 different identifications for that very plant.
by the way - little funny story - Mr Chamberlain was furious at having his name used for the plant, even though he bought the best of the first batch ever imported; the name was given by the famous Fred Sander ( The Orchid King) of Sanders Orchid Hybrid Register fame - amongst other things. he said he used the name because of the twisted cork-screw like petals , which reminded him of Mr Chamberlains moustache and because the Chamberlain family money came from their business of mass producing metal screws.