Not powdery mildew. I've noticed it on some of my Nep leaves, but a quick rub with a wet paper towel gets rid of it pretty easily. I'm not sure what it is, but I think it might be mineral residue from the water I use. It doesn't really seem to harm the plants though.
Im fairly certain this is just dried flakes of sphagnum moss.
~Burgeoning connoisseur of all things ventricosa or otherwise tubby.~
Ya, i recently bought this plant. Prob from stress then. thanks!! really appreciate the feedbacks