dave weil writes:

One thing worth noting is that Muncy's roses are all fortuniana
rootstock.

He sells both ownroot and grafted.
From his website:
"We carry a line of Hybrid Teas, Floribunda and OGR's. We are most excited
about our new line of David Austin roses. We will be offering them as well as
all our roses either own root or grafted on Fortuniana. All our roses a
guaranteed virus free and healthy.".
http://www.muncyrose.com/frame.html
Julie