Originally Posted by F15eMav
Do you have any substitution recommendations if I can't find Mosaic?
Truthfully, there is such a small amount of Mosaic in there, especially when compared with the later additions of Citra, that I'm not sure how much of the Mosaic character comes through. I would say that you could easily use all Citra, or a neutral flavored bittering hop without much discernible difference.
FWIW: I saw some Mosaic in stock on Rebel Brewer's website if you want to stay true to the recipe. Galaxy and Citra are both considered substitutes.