Ailment on leaf

[moniluhum]

This phal was appeared to be healthy in fact it is blooming. However, all of a sudden one of it's leaves began to wrinkle. I am thinking fungal but not sure. Any ideas and remedies?

[ksriramkumar]

Looks like some kind of heat damage to me. is there a chance that some heat source near this phal?

[raybark]

I have seen that from time to time, Monica. That leaf is being aborted by the plant for some reason, its nutrients resorbed, and it'll fall off on its own. Unless it spreads to other leaves, it's nothing to be concerned about.