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Growth on dog roses

Anyone know what the orange/brown match-head size growths with spiny
looking things are, that grow on the leaves of our common wild dog
roses ?  The roses don't look sick. They are hollowish when you open
them, so I think they are vegetative in nature. 

Sincerely,       
Carleen Rosenlund of Rainier, Oregon -zone 6
Sweetbriar - Keeper of Sheep & Old Roses
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