small agaric (2)

small agaric (2)

Observation - small agaric (2) - UK and Ireland. Description: Open area of woodland on felled broad-leaved wood.It was growing in a small trooping group in moss on large felled tree, cap smooth,slightly umbilicate dark brown in centre size 2-5cm,stem 2-5cm concolorous with cap,slightly white wolly at base,otherwise

Open area of woodland on felled broad-leaved wood.It was growing in a small trooping group in moss on large felled tree, cap smooth,slightly umbilicate dark brown in centre size 2-5cm,stem 2-5cm concolorous with cap,slightly white wolly at base,otherwise smooth,flesh greyish-brown. I have tried to narrow it down and can only come up with Tephrocybe atrata but it is rare and southern or a Clitocybe barbularum but gills don't fit, probably wrong on both HELP