Phyllonorycter gemmea is a moth of the family Gracillariidae. It is known from Massachusetts and Maine in the United States. The wingspan is 7-7.5 mm. The larvae feed on Robinia species, including Robinia pseudacacia. They mine the leaves of their host plant. The mine has the form of a blotch mine on the upperside of the leaf. References gemmea Moths of North America Moths described in 1873