I was driving along today and saw a particularly striking example of Gymnosporangium juniperi-virginianae (cedar-apple rust) in action! I saw at least three trees in the area with this amazing bright orange fungus, but one of them was completely covered! Here are a few photos that I took:
A side view of one of the fungal fruiting bodies progressing through the stages of maturity.
A particularly juicy fruiting body as seen from below.
A small portion of the tree covered in the fungus.
[Photos by Brendan Hodkinson.]