A pretty species Zygopetalum, these plants were imported by us from the USA. Kept for our own collection to flower and enjoy we are letting 3 of them go only. A little pricey do the cost of importing these quality plants.
These are the var nigrescens which I cannot find much about but bought from a very reputable source so as confident as you can be about plants bought from someone else.
Orchid Species Site link < we have found that these have been low fuss in Melbourne and are happy and healthy without heat. Photo is just a generic Zygo plant these mackayii are currently in 80mm pots they are 2 years out of flask.