This week's Observation of the Week is courtesy of Michael Sadler . He observed this on 6/26/2021. The genus/species is most likely Gymnosporangium juniperi-virginianae . You can find out more about this mushroom at:
https://en.wikipedia.org/wiki/Gymnosporangium_juniperi-virginianae
https://www.fs.fed.us/wildflowers/plant-of-the-week/gymnosporangium_juniperi-virginianae.shtml
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/gymnosporangium-juniperi-virginianae
Mushroom Expert:
https://www.mushroomexpert.com/trees/juniperus_virginiana.html
(which links to this page: http://www.midwestnaturalist.com/gymnosporangium_juniperi-virginianae.html)
Don't forget to follow Michael on iNaturalist: @masadler