Here are some other color forms of this brazilian species.
The first is a very particular color form inside the labiate Cattleyas, probably unique in combining white lip with light pink petals and sepals. Actually, the lip shows some variation from year to year, sometimes plain white, sometimes with a blow of pink. That's why some call it foma concolor and others forma albescens. I prefer f. albescens mostly because Heitor Gloeden used to label it this way.
The second is a forma amoena, often subject of some confusion with forma amesiana. Both these forms have the same pink lip, but while f. amoena has pure white sepals and petals, f. amesiana has them light pink.
The third is an ordinary f. semi-alba.