Quince RustGymnosporangium clavipes
Oak Ridge, TN
March 15, 2009
I noticed this weird gel fungus growing on an Eastern Red Cedar tree in my neighborhood. It had just finished raining, so the tree was still quite damp. According to a plant pathologist from Cornell University (who kindly identified it for me), this fungus will "infect the stem and will eventually girdle and kill the infected branch." This fungus is in the same genus as the Cedar Apple gall (Gymnosporangium juniperi-virginianae). We do have quince and apple trees growing nearby which serve as the "summer host" of the fungi. The spores alternate between the two different kinds of trees through the fungi's life cycle.