Margo,

I am not personally familiar with this genus but I do have some information that might help you. It seems that both species you mentioned grow in high altitudes so there native habitat is a little bit hard to replicate.

They like temps around 65F-70F in the summer during the day and night time temps averaging around 55F. Winter temp averages are slightly lower. With a 11-14F range in between daytime and night time temps.

They also like extremely high humidity levels, around 85% to 90%. The article I have specifically mentions mounting these species but also mentions that growers have had success with bark mixes. It just needs to be well aerated and not remain soggy. They seem to like heavy waterings but like to dry out just as fast.

I hope some of this helps. Good Luck