No common name.
Whilst grovelling underground in a cave near Pendine, I came across this growing out of the mud. Its velvety cap drew my interest and helped in working out what it was.
Looking in Dad's Funga Nordica the key to identification was the shape of the pileipellis. I then handed the specimen over to Dad for microscopy.
Under the microscope the shape of the pileipellis clearly matched the picture in the book! Win!