Trithor
Chico (..... the clown)
Koopowitz also adds, in his Tropical Slipper Orchids book,page 141, hirsutissimum not only has a hairier stem but its also shorter(approx 6 inches) then what is found in esquirolei (approx. 12 inches). Another interesting fact he mentions is the length in time it takes for a seed capsule to mature on hirsutissimum, 15 to 18 months where esquirolei is the standard 6-9 months. This I've not heard before.
I will have to self my plant is what happens.
There seem to be more differences between the two other than leaf morphology. I remember a similar discussion some years back on dianthum/parishii.