Hi Von,
I don't have enough experience to tell you for sure but possibly it has a virus. I would search the message board for other posts with photos to compare. It could also be environmental stress - but if other lilies in the same bed (presumably with the same soil - nutrition issues) don't show the same symptons it makes you wonder. Some lilies are resistant to virus and can live with it for some time, showing relatively minor effects (such as mottled foliage, reduced height, fewer blooms). I had one lily out of a group of orientals that came up with mottled foliage like yours. Because I have a number of types of lilies in my garden (some more vulnerable than others) I dug it up and threw it out to be on the safe side.

Good Luck,
Helen

My vote is for virus. I just tossed one out that looked like that.