I suspect this is an impossible one but nothing ventured, nothing gained. Found growing in
Sphagnum under Birch at Malham Tarn. Cap about 12-16mm diameter, no really obvious taste or smell apart from a general fungusy one.
Microscopy
Spores:
Cheilocystidia:
I thought it must be a
Galerina when I looked at the spores and cheilocystidia but the hyphae in the cap seemed a lot larger than anything mentioned in FoS. The shot was take at x40 which makes the hyphae something between 12µ and 21µ wide. They also seemed to be partially encrusted which perhaps doesn't show up well in the photo.
Hyphae from pileus - with clamp:
Any thoughts, comments, considered deliberations or wild guesses gratefully received as ever.