
Vein Pocket Galls (Macrodiplosis majalis) on Scarlet Oak (Quercus coccinea)
Galls growing on the veins of the underside of an oak leaf. They look kind of disgusting to me...like pustules!
The Macrodiplosis genus is still not well-described, so it is always possible that this is another species. Visually, it is a match on BugGuide.
Similar species: True Flies

By Flown Kimmerling
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Uploaded Dec 4, 2019. Captured Dec 1, 2019 14:08 in 1850 Carters Dam Rd, Chatsworth, GA 30705, USA.