I can't get this one to key out ...

Fairy ring in lawn on damp clay.

Sturdy looking mushroom about 4inches high and about 3cm across cap.
Gills white, decurrent but not massively so. Spores white. Veil
(cortina?) on younger ones but I don't think it persists as a ring. Cap
tan around edges, pale tan over most of it, dark brown dusting at very
centre. Elastic band sort of consistency - not matte, but not waxy.
Domed - normal mushroom shape. Flesh springy rather than crumbly. Stem
similar colour to cap, whiter towards top, and with yellowish
powder/wool towards base.

Working hypothesis Clitocybe rivulosa
--
Kay Easton

Edward's earthworm page:
http://www.scarboro.demon.co.uk/edward/index.htm