Hi, Susan...Perhaps someone here has this guy and can chime in with their personal experiences growing it. But, to get things started, here's the IOSPE page for it: IOSPE PHOTOS
I've got 2 of them.... this plant is beautiful...
the leaves has the form of a heart... I recoment it.... it needs no extra care...
In my conditions they grows very good...
My conditions are:
temperature intermediate
never put the plant in direct sun ....
They are allways in shadow...
They grow better with high humidity....
They are from the cloud forest you can recreate this conditions ... allways cloud and heavy humidity...
I fertilize them weekly and watering once a week... it depends of the week conditions....
You can find a treat of my cardiothallis in the forum orchids in bloom... i think I post it a month ago... so you can see the bloom of my plant...