Wasn’t it a bit early for mushrooms? I had never seen such a fuzzy yellow growth. Perhaps it was something else. When I posted a photo online, I learned it might be a young dyer’s polypore. Evidently, the timing of all kinds of things is more variable these days.
I found two. They both started out as fuzzy yellow lumps and kept changing. Dyer’s polypore seemed correct as there were certainly pores rather than the usual gills on the undersides.
I learned dyer’s polypores can be used to stain fibers a number of different colors – yellows, various shades of browns and even greens – depending on the type of fiber and how it is pretreated. This video shows it being used to dye wool lovely shades of yellow.
The first two photos below show the two I found mid-way through their cycle and the remaining photos show the changes that each went through closer in.
Radiant Refuge 