Waxcaps on the lawn

Having left the lawn uncut for a couple of weeks during which a lot of rain fell I came back from holiday to find the lawn covered in waxcaps, one of the blackening species. From my fungi book I would have said it was Hygrocybe tristis or Hygrocybe conica var tristis as some sources have it

but the whole taxonomy of waxcaps seems a difficult area so I am not sure.