What kind of fungus is this?

yes....they come from rotting wood....try to dig them out and remove rotting wood also...

they will attack weakened trees also

stay alert and remove asap to try to get rid of them

Pretty sure those are poisonous.

Look like ringless honeys. They’re awesome sautéed with butter and garlic

if they are what i have had in past they will grow from dead wood and things like old roots left behind after a removal...

i do not think these are the tree killer ones but hard to tell from picture....there are two tree killers...one is a white round one that will grow from size of golfball to softball overnight and keep going... if left alone it will start replacing the tree and eat into it at the base of the trunk and eventually killing it...



the other tree killer looks like this but i think a little darker brown..???....it does the same thing and rings the tree at the trunk destroying bark which then kills tree (no way water can go up tree)...it pops up around on dead wood and if spores find your tree it is bad... i have fought both and won against the white one but lost a mature oak to the brown one...

i do not mess around with fungi in my yard... if wrong kind can be bad so i treat them like snakes....i know many good but in my untrained eye...all bad...

I thought about picking wild mushrooms as a hobby, but my first pic looked like it would be one of two and one was poisonous.

It still seems like an awesome hobby sautéed fresh mushrooms are amazing.