Ok here's the deal,

An Ivory is a leucy, but a leucy doesn't have to be an Ivory.

Alot of people out there don't consider the Ivory or Pearl(Super/Homozygous version of Woma) to be Lucies, but they are indeed. Their beef is that these animals have appreciable amounts of pigment(yellow dorsal stripe and head purpling for the Ivory, and an offwhite color with the pearls), but small amounts of pigment other than black(melanin) are allowed, but no patterning.

Also, just thought I'd throw in there that technically Pieds are also leucisitic, but in only a partial manner.

Here's some more reading:

http://en.wikipedia.org/wiki/Leucism

-Dan

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