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Galls on cultivated sycamore maple (Acer pseudoplatanus)
Quercus stellata
Both green and brown galls had pupae or adults inside.
This is a picture of Taphrina farlowii on a black cherry at Rockburn Branch Park near Elkridge, Maryland.
Small hidden bark cell in bur oak
NOTE transparent, exit slit not obvious on bottom of gall, does not go through leaf surface like most macrodiplosis galls.
Q. stellata. Multiple galls on the same tree. Sending to Forbes lab
Photo by Doug Tallamy, used with permission- he is looking for an identification