[H&H]

It’s Chlorophyllum molybdites. It is a sickener/ poisoner. It will help fix nitrogen and trace metals in the lawn….fungi are little chemistry labs. It probably is attached to the laws root system….takes a little sugar from the roots and shares some nutrients with the grass. Pulling the mushroom won’t hurt the parent organism, it will prevent sporulation though.

 

[H&H]

Fungi are decaying old wood under the ground. Where possible dig down and pull out the old roots.
Wrap a cable around the root and give a gentle tug--(with your pickup.)

The fungi in question is Chlorophyllum molybdites...it lacks the metabolic enzymes to digest lignins ( wood, straw etc) and occupies an ecological niche as a mycorhyzzal facilitator of grasses.