Or Phragmidium mucronatum - might see teliospores in the fall. Photo 5: Urediniospores - 1 Div=10um, Photo 6 1 Div = 1 um See R. nutkana in list - Note to self - check teliospores and compare dimensions to P. fusiforme (?) Might need genetic analysis.
On a wild Rosa sp.
Lake Wenatchee state park.
Shot with iPhone11.