I have added agreement to Lichenomphalia umbellifera, but this looks like the sphagnicolous varant, formerly called 'Omphalina fulvopallens'. It was described as a paler, more yellow species and was thought not to be lichenised. However, subsequent electron microscopy has shown that it is indeed lichenised, and it seems best regarded as part of the colour variation of L. umbellifera. See http://www.lichens.lastdragon.org/Lichenomphalia_umbellifera.html

Alan