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.
This could be Choke, Epichloe typhina, as it appears to be on a grass. Early stage is white changing to yellow.But it maybe is too big!
Other possibility is that it is a Slime Mould!
I can't be certain of either.
The more I know the more I realise I don't know
Lat/Lng: 54.9, -4.6
OS grid ref: NX3468