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Thorns growing

Branched thorns growing from a trunk of honey locust (Gleditsia triacanthos) near Deer Run Trail in Rock Bridge State Park. Columbia, Missouri, September 12, 2005
Tuft of striped ramalina lichen (Ramalina montagnei) growing on thorns of black locust in Lick Creek Park. College Station, Texas, January 13, 2020

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