You can have some general information from this site
Coryanthes - I only do not agree with the part of the bees avoiding the flower for several days. I know some Coryanthes from Venezuela, and my experience is that the bees go in the bucket repeatedly... it is like if the liquid in it were some kind of drug (the bees really look sometimes like being drunk!) Bee goes swimming in the bucket, goes out, falls to the ground, stay walking in cyrcles for a while, flies up to the flower and repeat the cycle again and again (this is to ensure pollination - yes, nature can be quite ingenious and tricky sometimes), if they are not eaten by the lizzards that join below the plants for an easy bees-buffet...
Coryanthes bruchmuelleri was originally considered a synonym of Coryanthes bungerothii, but was separated afterwards. I assume the cultural needs should be similar...