WOW
WOW
There are some primary hybrids backcrossed to sanderianum. I don't grow that many Paphs these days but I do have a few of those back crossed to sanderianum, Michael Koopowitz X sanderianum is one of those I have and it is growing as slow as sanderianum...
I have never heard about "lowland and highland forms"...

here's an update:
i don't think it can be a hybrid. longest petal is for now 58cm. sanderianum with 1m petals are not very commun. thus i saw picture of in situ sand with such leaves. may depends of nutrition and quantity of sunlight they get. local people which saw many wild sand in cultivation told me that usually they saw petals in the range of 40-50cm...
Amazing, love it.
OMG...what a cool paph!! Love it!![]()