Cordyceps militaris or Scarlet Caterpillarclub id by MWS.
It grows an the body of a dead butterfly or moth larva or pupa, its mycelium replacing the
insides of the dead insect.
These come in a wide range of colours. Sometimes intermingled as if the mycelia are associated in some way.An altenative name for the group is the Fairy Clubs.
And a little mushroom. All these were in the same lawn - a nice, unfertilised, closely-shorn lawn with plenty of moss! It's at Saville Park, Halifax.