I Have a White Mushroom Looking Fungus Growing on Several Azaleas
What is this and is it bad for my bushes? How do I get rid of it?
This article might help; https://www.gardeningknowhow.com/ornamental/shrubs/azalea/common-azalea-problems.htm
Is this on your plant, or is it growing in mulch? If you are sure it is a fungus, consider purchasing an all purpose fungicide and using according to package directions.