Help with dark brown/black on orchid leaves

[TheAMP]

Please help me identify what is wrong with these two mounted orchids. I am in Central Florida; the orchids are mounted and in bright, not direct sun in my screened lanai. I mist daily.

The Angr florulentum is on cork bark.

The Encyc cordigera is on tree fern. The growth on the left has dried up and is very hard.

So...what is this? Can the orchids be saved? If so, how do I treat them?

Thank you.