I found this small slender mushroom in the grass at the Brhyer campsite.
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.
I don't think its Volvariella gloiocephala as I think that is bigger than your specimen. My first thought would be one of the small Coprinus although there is something about it that does not seem quite right for these. Can you remember if it had a volva (a sack at the base of the stem) or what colour the gills were, perhaps its rather a long time ago in Sept to remember these things.
It is definitely not a Volvariella or a Coprinus. With the yellow centre it could be a Bolbitius.
I'd say it was a mature B. vitellinus. It looses its yellow egg colour as ita ages. Brown spores and spherical cap cells and very delicate.
I think you could be right about it being a mature B.titubans syn. B.vitellinus. I think I've seen these in the field, they have a viscous cap when young, but really flatten out and lose colour with age.
Lat/Lng: 49.9, -6.4
OS grid ref: SV8815