My cymb had the same kind of black spots at the base, I re potted it and moved it out side where it was cooler, it seems to be doing better now and no new black spots have shown up
You have sunburn, don't waste your time with physan.
Your biggest problem is questionable culture. If it has been inside, get it out with more humidity, a regular fertilizer/water regime and lower temps. You may also consider repotting it in fresh mix and cutting off the roots of all the leafless pseudobulbs to allow for the other 1/2 shortened roots on the green bulbs to spread into the new mix.
Cym Ladye
Last edited by Cym Ladye; 04-26-2013 at 01:21 PM..