Dark fieldcap

Appearance

Cap - 4 to 7cm across, hemispherical becoming broadly umbonate; the mid to dark brown cap surface usually pales somewhat towards the margin but does not fade, as other fieldcaps do, at maturity.
Gills - Adnate or very slightly decurrent; initially pale brown, turning dark brown as the spores mature.
Stem - 5 to 10cm long and 0.7 to 1.2cm diameter; cylindrical; whitish streaked with brown, darker towards base; retaining a persistent, pendulous pale brown ring with radial striations.
Spores of Cyclocybe erebia - Ellipsoidal, smooth, 9.5-13 × 5.5-7.1µm, with a shallow snout-like protrusion.
Basidia - Usually with two spores per basidium.
Odour/taste - Not distinctive.

Naming

Some snonyms - Agrocybe erebia, Agaricus erebius

Habitat

In tufts or small groups, rarely solitary, saprobic on the litter of hardwood and softwood forest floors, hedgerows and sometimes under trees in parkland; occasionally on well-rotted woodchip mulch.