Okay this is my odontoglossum. I have had it for about a month. It is one of my biggest oncid I have. Everything is the exact same as the other guys same window they are just smaller.
I saw this odd coloring coming up off of the older phulbs...is it because the growths are older? Are they dying back? Whats up....I did go a head and soak it in some physan water just to be safe. Also just saw today the yellowing of the leaves on the phulbs with odd color.
They just look like older pbulbs to me. Many, if not all, pbulbs seem to get this slight browning as they age. I wouldn't worry about it. They can stay this strange green/brown for years yet.