Help in IDing Leaf Spots on Cattleya

[c123anderson]

Hi everyone. Can anyone help me ID these spots on a cattleya leaf?

History: cutting given to me with a caution of mother plant being treated for scale. Cutting has been monitored for scale for last 3 weeks with 0 scale seen but with prophylactic treatment nonetheless.

I have planted cutting in bark and it's sitting -- isolated -- by a filtered west-facing window with good air movement and around 40-60% humidity.

Ever since I received this cutting, I have noticed these spots. They are easier to see with the light through them. No significant change in their appearance and no obvious spreading to other leaves/rest of plant. No other obvious critters, either.

Is this leftover potential scale damage or something else to worry about? My research has turned up nothing.

Thank you!

[Roberta]

That looks to me like scale damage. They take a bite from the underside of leaves, and once done, it doesn't go away.

[c123anderson]

But I’ve routinely inspected for scale and haven’t seen any. So, likely, since there’s no status change in damage that this is scale damage and keep maintaining plant toward health?

[Roberta]

I think it's old damage (but the cause has been removed). Going forward, just nurture it to health.