I noticed a large clump of sap in my lawn, and determined that it came from the Austrian pine tree nearby. (I didn't know what it was at first because of the color, but it had a strong pine odor). A 3-4 inch diameter branch was cut off about 10 years ago, and this sap came from that stub.
I've never seen anything like this. Is the tree unhealthy/dying? I haven't noticed anything else that leads me to believe the tree is unhealthy.