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Note: this is the genus Agaricus, the 'true' mushrooms, of which there are about 50 in Europe. It is a notoriously difficult group to identify accurately, but only the first one is poisonous. Smell and colour change on bruising are helpful id characteristics.
Cap domed when young, white and smooth, or with brown or greyish scales. Longish stem with pendulous ring. Edge of cap, ring on stem and base of stem bruising bright yellow in a few seconds. Yellow fades after twenty minutes or so. Very variable.
Cap white, sometimes pale-brown and scaly, bruising slowly pink. 7-10cm diameter. Ring on stem small and fragile, remnants of ring overhanging cap. Young gill bright pink, dark brown with age. In rings in pasture and lawns.
White cap, large (10 - 20cm), almost spherical when young. Stem smooth, substantial, and with swollen base and a large pendulous ring with 'cogwheel' markings visible below, especially while still attached to the cap edge. Entire mushroom will bruise yellow, but over a period of half an hour or more. Yellow discoloration does not fade.
As above but much more slender and growing in woodlands.
White smooth to light brown and finely scaley cap, very large (10 - 30cm), almost spherical when young. Stem floccose, substantial, and with a large pendulous ring with less distinct 'cogwheel' markings visible below. Entire mushroom will bruise yellow, but less so than previous species. Yellow discoloration does not fade. Smell earthy or, in older specimens, of urine (!) and definitely not of almonds.
Fairly small, brown and scaly mushroom which grows in woodland. All parts bruise dramatically blood red.