When I checked on the watermelon plant today I found this odd discoloration at the soil level, hidden under the leaves right by one of the fruits. I assume this is a fungus; is it dangerous? And if so, what should I do about it?
ETA: it turns out to be all throughout the patch of watermelon, and in some places is bright yellow: https://www.dropbox.com/s/qq9luo3pzrsms15/2020-08-05%2017.38.10.jpg?dl=0
I also found mushrooms that might be related: https://www.dropbox.com/s/dbmtman6xyawcpx/2020-08-05%2017.42.09.jpg?dl=0