A  No, I suspect the parentage is correct, but either the hybridizer or the vendor may not have done his or her home work. For more than 70 years, the color inheritance in cattleyas, first elucidated by Professor Hurst at Cambridge University in England, has been fairly predictable with just the odd surprise. However, nature has many ways of confounding our best predictions. When I crossed Cattleya Atalanta ‘alba’ with Brassavola digbyana ‘Mrs. Chase’, an alba form of the species, I hoped for interesting ice-green progeny. When the seedlings bloomed, however, they were all green overlaid with old rose - no albas appeared. My first inclination with your seedling might also have been to expect pure-white offspring, but C. walkeriana may well have two alba types, one from both of Hurst’s alba groupings, and I have observed it is a cattleya parent that gives the occasional surprises in colors. — Andy Easton.