Agaricus on a barren pasture at Beestonmount 28 March 1839. Pileus slightly fleshy, smooth, nut-brown, fades when dry and then with a silvery lustre; margin jagged with A. hemanius of R. Boyer; gills subdecurrent, close ferruginous, at length black at the edge with slender. Pollen equal, fistulose, minutely perforate, dark brown, slightly bent. Tenuely separable to A. mutabilis Schr., as described in Beesley, Pileus at first conical, obtuse, at length sub-pyriformate (Shaw 1839) to a "expanded" apex of the pileus recurvans of a darker brown and is loosely nut-brown; the margin opaque, having sometimes lacerous portions of the veil adhering and to appearing toothed. Gills broad, the longest slightly decurrent, the next veins reaching the stem. The flesh white, very thick, firm tender, dark brown, offering firmness, from faint minute pale accumulative scales; grown above. No appearance of a ring. Spores hemi-ochre-purple, notate, acute at both ends, the fertile opaque; They colourless to transparent and abundant lace without content.