I had to enlarge the photo in order to see the 'cobwebby' mycelium - and yes, that's mould alright - unusual colour - whenever I get a dose, it's normally grey.
Looks like the bees have brought some spores back
http://www.almanac.com/pest/white-mold along with the pollen. But there's still plenty of good pollen in that frame - personally, I'd be tempted to move it nearer to the brood nest. If it stays where it is, the mould will only flourish until it completely covers the comb.
LJ