Are you sure it's not a mislabeled N. x ventrata?
It's N. ventrata
your media looks dry-ish
dont know for sure though.
My point being that for the 5 bazzillionth time someone fairly new has gotten a piece of this plant and in their collection it is called N. alata, regardless if Deroose has it 'Alata' makes no difference. If people are going to go around trading, giving away, selling this plant believing it is the species, then it needs to be corrected whenever it pops up.