Yellow stainer
Agaricus xanthodermus
An informal survey of the plant and animal life living in or visiting the grounds of Pointfield, Kelso since 2015
Fungi
Cap initially white but tending to become beige centrally; surface finely flecked and tending to crack as it ages; thick and fleshy; initially domed but flattening as it opens, reaching 7 cm in diameter. Gills initially pink when closed, turning brown on opening; free; dense. Stalk up to 9 cm long and 2 cm in diameter, with bulbous base; smooth, with prominent double ring. Base stains a strong yellow immediately on sectioning, as does cap where it is bruised. Spore print dark rusty red; spores dark coloured in KOH, elliptical with small nipple and no germ pore; smooth surfaced; 5.8-6.2 x 3.8-4.2 um (mean = 6.0 x 4.0 um; n=11). Cystidea small and bulbous.
June: In grass in front of holly trees near the Oak. September: widely distributed around the garden both front and back.