On a mossy, very damp lawn. If the weather continues in the current pattern, habitat may need to be updated to "swamp".
Third photo taken with flash. Scale is cm.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Your suggestion isn't in Phillips, but looks good when googled. The habitat is right, and the gills fit better than our original idea. Now, who wants to tell She Who Must Be Obeyed?..
Lat/Lng: 54.56, -1.3436
OS grid ref: NZ425185