On cultivated Quercus alba, The Morton Arboretum, living collections accession 2131-29*3
Entrance to hive in trunk of silver maple.
Cell phone photo, documentation shot.
This is a picture of Thecodiplosis brachynteroides on a Virginia Pine at Northwest Regional Park in Owings Mills, Maryland.
Just a guess, @jeffdc thoughts on whether an insect or mite gall, or a fungus? I thought bug in last photo might possibly be the gall-former so included it
Not sure if Chinkapin or Chestnut
This is a picture of Thecodiplosis brachynteroides on a Virginia Pine at Quiet Waters Park near Annapolis, Maryland.
Gray Squirrels up in tree eating the acorns