alan j., you are IMPRESSIVE!
I thought about researching that fern (when I finally got online a few minutes ago and saw Di's new post) and decided I didn't feel like competing today. I have an appt to get ready for anyway, and looking up a fern was likely to be an involved proposition.
All I really know about ferns is that they pretty much don't grow (in the wild) here.
So thanks for the information.