Noid with virus
I have had this plant for about 20 years and don't prune it and basically it is just there.
I would say this looks like a virus to me. I don't suspect HVX because of the plant's history and because HVX has a history dating back only to 1995. It is in a location isolated from any other hostas. I think I will now see how difficult it will be to kill with glyphosate. ???