This annual polypore is very unusual in that it grows in the soil rather than on dead wood.
upper surface zoned concentrically in shades of ochre, grey and rust with maroon tinge, disc-like, at first finely downy, becoming smooth with age; stem rusty-brown, downy, more or less central. Flesh brown, thin, corky, harder when dry.
Several tooth-fungi are similar above but have spiny undersides.
on the www.first-nature.com web site.