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Phylacia sp.
Approximately 1/16 inches or 1.5875 mm in diameter.
I believe these were on an alder tree.
It could very well be, Tristan. To be honest I am not familiar with black knot fungi, I only know it from online photos and read that it affects Prunus trees. It's just that in photo 3 I believe I see slime trails, which makes me think it's a slime mold.
Maybe the same as this one. Was it extremely hard?
http://mushroomobserver.org/207114?q=2jR...
Great spotting, Tristan. I think it's a slime mold, perhaps Badhamia utricularis, but that's just a wild guess.