Peloquin solved it. Thank you!

I think I saw this around 1957 but maybe within a few years after that. I thought it was a Twilight Zone episode but don’t see anything in their episode list that resembles this.

A ship, surrounded by fog, hears a voice from a rowboat nearby. Can’t see it, of course because of the dense fog.  The voice recounts a tale where everybody on a nearby island (shipwrecked??)  has succumbed to a sort of Spanish moss malady that covers everything in the island. Of course when the fog lifts a bit, we (and the person on the ship) see that the person in the rowboat is covered with the stuff. Hope you can help. This thing gave me nightmares when I was a kid.