What are these orange spikes on the serviceberry fruit? It is a fungus called cedar-quince rust (Gymnosporangium clavipes).
This fungus actually has an interesting life cycle. It starts with an infection of a plant in the juniper (Juniperus) family. In the late spring after a good rain, the fungus produces a large orange clump on the juniper. The fungal spores, called basidiospores, are carried away from the juniper by wind and rain. The spores land on and infect a plant in the rose (Rosaceae) family. This family includes serviceberries, hawthorne, apple, pear, and quince.
In this case, the serviceberry was infected. What we see here is the next stage in the fungus life cycle, where the next set of spores, called aeciospores, are displayed on the fruit. These spores will be carried by the wind back to a juniper tree and start the life cycle all over again.