Den. Kingianum with fungus or parasite?

[tcrane]

I inherited these two plants from a friend, both are improving and sending up new canes, the larger in a pot has several canes which look like they are preparing to bloom.

And... they both have some kind of rust-looking discoloration on the underside of some of their leaves.

Photos here -

http://www.orchidboard.com/community...-parasite.html

The smaller, mounted on a stick, also has them on the top of the leaves.

Any advice as to what this is would be extremely appreciated!

-Tristan