Specimen #42 Black Knot Fungus
Apiosporina morbosa
Photo by me, Ft. Des Moines Park
Occurs on plum and cherry trees. Native to North America. You might be able to see the horizontal lenticels (breathing holes. See _Discover Nature in Winter_.) on the branch in the upper right.
I have not read anything that says this organism has a use for humans. We see this fungus fairly often in all of our walks all over the state. It is hard and looks black and dry. The form is irregular.
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