Reference to the 'scales' that sometimes form on the cap.
Better known by its older scientific names of Agaricus urinascens and Agaricus macrosporus. A distinctive mushroom that whilst on face value looks similar to other larger Agaricus has subtle differences. The stem is 'rough' below the ring and smooth above it. The smell of this species, especially when mature, is more like ammonia or even urine (hence the scientific name). Probably under-recorded or mis-identified for other Agaricus.
With small specimens it is not really noticeable, some smell slightly almondy. More mature specimens begin to smell of ammonia or even urine.
Summer to Autumn.
Habitat & Distribution
Upland grassland, moorland edges, pasture, coastal grassland, woodland clearings and woodland edges are all places we have encountered this species. Widespread over much of the UK.
Edible. Whilst younger specimens are delicious, we find the more mature specimens have a smell with them which we don't like to eat.
Spore Print Colour
9-12 x 6-8µ, ovate.
Horse Mushroom (Agaricus arvensis) is similar but the stem has the same texture above and below the ring and has an aniseed smell.