Never mind the spelling; are you sure about the 90 letters??! ! Portuguese-speaking would be something like Lusitanophone, or if that's meant to be 9 letters, maybe Lusitanic (though just means generally Portuguese...)
Many thanks to mike b and jane mark 2 for excellent answers despite my stupid 10-times increase in the length of the unknown word.
I shouldn't type when half-asleep!
Artemesia.