Help me save my humble Paphiopedillum Collection

[Ray]

Depending upon the particular plants in their background, neither of those is a particularly fast-growing plant, and I think what you're seeing with the Paph. rothschildianum is merely damage caused by the plant resorbing resources from the oldest leaf while under stress.

That'll teach ya!!! (To make sure it always gets what it needs, and hopefully not to worry about it so much.)