Are They suppose to drip a brown liquid?

Question

Our Linden tree is dripping a brown substance.

The part of the tree that it drips from looks black.

We hope that it does not have a disease.

Answer 1

Here are a few articles that should help answer your question.
https://www.gardeningknowhow.com/ornamental/trees/linden/diseases-of-linden-trees.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/wetwood-bleeding-trees.htm
https://www.extension.iastate.edu/news/2007/jun/070801.htm