Late-season wildflowers and a question

Late-season wildflowers and a question

My employer's yard is heavily landscaped, but the borders of the yard are given over to whatever wants to grow there (within reason) since the house is surrounded by pasture-land. I found a nice patch of wildflowers today and decided to share. Not sure what this one is. I never really noticed it until it bloomed. From a distance, it looks like little puffs of white just hanging in the air. The plants themselves are about 5' tall. This was growing at near the white flowers. It's short - no more than 6" tall. If this was growing in the yard, it would have been pulled up long ago. Amongst the other wildflowers, it adds a nice bit of color. I believe it's thistle. Please correct me if I'm wrong. More thistle. If it wasn't so stickery and invasive, I'd plant it somewhere at my house. It's just so pretty when in bloom. Now for the question... When I put in this flowerbed, I knocked several shelf-looking growths of fungus off the tree stump. I thought at the time that'd be all it took to get rid of it. Now we've had several days of WET and the fungus is coming back. Any suggestions on how to get rid of it? Will it harm the plants I've put in the bed? Does it have roots or something that I need to dig/cut out of the stump? If it stayed all white and fluffy, (and won't harm the plants) I'd consider leaving it alone, but it eventually gets all gray and slimy and icky. Any suggestions are greatly appreciated.
squirrels

squirrels

My tiny apartment!

My tiny apartment!

Studio Vs. One Bedroom

Studio Vs. One Bedroom

What Now?

What Now?

Porn!

Porn!

Emma. 14.

Emma. 14.