One of the common coniferous trees on the property is the balsam fir (Abies balsamea). If you live in the northeastern U.S. and have had a live Christmas tree, this is probably what it was.
Press hard enough, and they’ll burst, squirting sap-like resin all over your hand so that you spend the rest of your walk sticky and smelling like Christmas. This is oddly satisfying, like popping a pimple.
I haven’t been able to find any information on why, exactly, the tree produces these resin blisters. Does anyone know? Also, have any of you ever tried the balsam fir motor boat trick? It’s on my “to-do” list for sometime when I’m on a wander near one of our lakes.