The fruit body is a mushroom with a cap atop a central stem. Caps come in various colours, are convex to flat; smooth, fibrillose or scaly; dry; from a centimetre or so to well over 10 centimetres in diameter. Given the size variation in the cap it is not surprising that the stems also vary greatly in size. White is the most common stem colour.
The gills are initially pale pinkish and appear to change colour to dark brown with age, but it is not the gill tissue that is changing colour. Spores are very pale when immature but become dark brown at maturity and it is the mass of mature spores that gives that colour. In some species spores mature early, in others late. Hence, in one species you may see a small, open cap with dark brown gills, but in another species a much larger, open cap but where the gills are still pink.
Technically the gills are described as free. This means that none of the gills reach the stem. What you see immediately around the top of the stem is a narrow circular furrow, as in this photo: http://www.cpbr.gov.au/fungi/images-captions/agaricus-sp-0037.html.
Very few genera have free gills so it is a very informative feature.
Warning: When a mushroom starts drying, the flesh distorts and in those species without free gills, the gills may tear away from the stem and appear free. Always be suspicious when you think you’ve seen free gills. Check carefully for signs of tearing, especially if the cap shows any signs of the wrinkling that comes with drying.
There is a partial veil that covers the gills in an immature mushroom. As the cap expands this breaks at the cap margin and leaves a membranous (and often skirt-like) ring of tissue around the stem There is no universal veil. In this photo (http://www.cpbr.gov.au/fungi/images-captions/agaricus-broken-veil-0036.html) you see a skirt-like veil remnant. The earlier photo shows a smaller ring.
Spore print: chocolate brown.
The mushrooms appear on the ground in a wide variety of habitats.
Some species of Agrocybe have partial veils and brown gills – but the gills are not free and the somewhat Agaricus-looking ones are most likely to appear on wood (live or dead).
Agaricus sp. is listed in the following regions:
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MapsANBG Australian National University Budjan Galindji (Franklin Grassland) Reserve Callum Brae City Renewal Authority Area Commonwealth & Kings Parks Crace Grasslands Dryandra St Woodland Dunlop Grasslands Gibraltar Pines Gidleigh TSR Goorooyarroo NR (ACT) Gungahlin Pond Hughes Garran Woodland Illilanga & Baroona Isaacs Ridge Isaacs Ridge and Nearby Jerrabomberra Grassland Jerrabomberra Wetlands Kosciuszko National Park Lake Burley Griffin West Lake Ginninderra Lyneham Wetland Mount Ainslie Mount Ainslie to Black Mountain Mount Majura Mount Mugga Mugga Mount Painter Mulligans Flat Namadgi National Park Queanbeyan-Palerang Regional Council Red Hill Nature Reserve Red Hill to Yarralumla Creek Sullivans Creek, Acton Sullivans Creek, Lyneham South Sullivans Creek, O'Connor Sullivans Creek, Turner Tharwa Bridge The Pinnacle Top Hut TSR Tumut State Forest Woodstock Nature Reserve
Points of interestGG105 Pollinator-friendly garden Conder1
PlacesActon, ACT Berridale, NSW Booth, ACT Bungendore, NSW Canberra, ACT Conder, ACT Cook, ACT Coree, ACT Cotter River, ACT Dry Plain, NSW Dunlop, ACT Fadden, ACT Forde, ACT Franklin, ACT Fyshwick, ACT Garran, ACT Giralang, ACT Googong, NSW Hackett, ACT Hawker, ACT Higgins, ACT Holt, ACT Hughes, ACT Hume, ACT Isaacs, ACT Jerrabomberra, ACT Kingston, ACT Lyneham, ACT Majura, ACT Michelago, NSW Mitchell, ACT Monash, ACT Mount Clear, ACT Nanima, NSW Ngunnawal, ACT Nicholls, ACT O'Connor, ACT O'Malley, ACT Paddys River, ACT Parkes, ACT Pilot Wilderness, NSW Red Hill, ACT Rendezvous Creek, ACT Scullin, ACT Symonston, ACT Tharwa, ACT Turner, ACT Watson, ACT Weetangera, ACT Wereboldera, NSW Yarralumla, ACT