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FungusAgaricus sp.

 

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.

 

Look-alikes

 

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).

 

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Agaricus sp. at Mount Mugga Mugga - 20 Apr 2019 Agaricus sp. at Jerrabomberra Wetlands - 18 Apr 2019 Agaricus sp. at Isaacs Ridge and Nearby - 17 Apr 2019 Agaricus sp. at Giralang, ACT - 17 Apr 2019 Agaricus sp. at Hughes Garran Woodland - 12 Apr 2019 Agaricus sp. at Gibraltar Pines - 7 Apr 2019 Agaricus sp. at Paddys River, ACT - 5 Apr 2019 Agaricus sp. at Commonwealth & Kings Parks - 21 Feb 2019 Agaricus sp. at Jerrabomberra Wetlands - 16 Dec 2018 Agaricus sp. at Lake Burley Griffin West - 5 Dec 2018 Agaricus sp. at Callum Brae - 27 Nov 2018 Agaricus sp. at Lake Ginninderra - 26 Nov 2018 Agaricus sp. at Namadgi National Park - 26 Oct 2018 Agaricus sp. at Namadgi National Park - 17 Oct 2018 Agaricus sp. at Symonston, ACT - 14 Sep 2018 Agaricus sp. at Jerrabomberra Wetlands - 28 May 2018 Agaricus sp. at Yarralumla, ACT - 5 May 2018 Agaricus sp. at ANBG - 16 Mar 2018 Agaricus sp. at Turner, ACT - 12 Mar 2018 Agaricus sp. at Jerrabomberra Grassland - 16 Dec 2017 Agaricus sp. at Watson, ACT - 10 Dec 2017 Agaricus sp. at Jerrabomberra Wetlands - 7 Dec 2017 Agaricus sp. at Mount Majura - 22 Nov 2017 Agaricus sp. at Namadgi National Park - 28 Apr 2017 Agaricus sp. at Ngunnawal, ACT - 10 Apr 2017 Agaricus sp. at Fadden, ACT - 8 Oct 2016 Agaricus sp. at Namadgi National Park - 18 May 2016 Agaricus sp. at Gibraltar Pines - 11 Feb 2016 Agaricus sp. at Mount Mugga Mugga - 7 Feb 2016 Agaricus sp. at Australian National University - 13 Nov 2015 Agaricus sp. at Australian National University - 21 Apr 2015
Agaricus sp. at Mount Mugga Mugga - 20 Apr 2019
Agaricus sp. at Jerrabomberra Wetlands - 18 Apr 2019
Agaricus sp. at Isaacs Ridge and Nearby - 17 Apr 2019
Agaricus sp. at Giralang, ACT - 17 Apr 2019
Agaricus sp. at Hughes Garran Woodland - 12 Apr 2019
Agaricus sp. at Gibraltar Pines - 7 Apr 2019
Agaricus sp. at Paddys River, ACT - 5 Apr 2019
Agaricus sp. at Commonwealth & Kings Parks - 21 Feb 2019
Agaricus sp. at Jerrabomberra Wetlands - 16 Dec 2018
Agaricus sp. at Lake Burley Griffin West - 5 Dec 2018
Agaricus sp. at Callum Brae - 27 Nov 2018
Agaricus sp. at Lake Ginninderra - 26 Nov 2018
Agaricus sp. at Namadgi National Park - 26 Oct 2018
Agaricus sp. at Namadgi National Park - 17 Oct 2018
Agaricus sp. at Symonston, ACT - 14 Sep 2018
Agaricus sp. at Jerrabomberra Wetlands - 28 May 2018
Agaricus sp. at Yarralumla, ACT - 5 May 2018
Agaricus sp. at ANBG - 16 Mar 2018
Agaricus sp. at Turner, ACT - 12 Mar 2018
Agaricus sp. at Jerrabomberra Grassland - 16 Dec 2017
Agaricus sp. at Watson, ACT - 10 Dec 2017
Agaricus sp. at Jerrabomberra Wetlands - 7 Dec 2017
Agaricus sp. at Mount Majura - 22 Nov 2017
Agaricus sp. at Namadgi National Park - 28 Apr 2017
Agaricus sp. at Ngunnawal, ACT - 10 Apr 2017
Agaricus sp. at Fadden, ACT - 8 Oct 2016
Agaricus sp. at Namadgi National Park - 18 May 2016
Agaricus sp. at Gibraltar Pines - 11 Feb 2016
Agaricus sp. at Mount Mugga Mugga - 7 Feb 2016
Agaricus sp. at Australian National University - 13 Nov 2015
Agaricus sp. at Australian National University - 21 Apr 2015

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