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In a church yard. 29 October 2020 Hampshire. Photograph copyright Leif Goodwin
Convex, expanding with age, smooth or radially fibrous, sometimes splitting radially, often with ring remnants attached to the margin, white, slightly brown or ochraceous with age, about 7 to 16 cm across
Broad, crowded, free, pinkish, then chocolate brown finally dark brown
Equal, often tapered at the base, sometimes bent, white, sometimes pinkish above the ring, ring large forming a double cog wheel pattern
Pleasant, sweetish, variously described as aniseed, almond or mushroom
Rarely reported but probably frequent
On soil with grass, or on dunes
Spores ellipsoidal, smooth (6-7) x (4-5) µm2. Basidia club shaped, 4 spored. Gill edge cystidia club shaped, cylindrical or globose.
The cap surface turns lemon yellow when a dop of KOH solution is applied. This is a characteristic of Agaricus species in the Arvenses, Minores and Xanthodermati groups. This species is closely related to A. arvensis. It is separated by weakly or non yellowing flesh, a fainter smell and smaller spores. Some authorities treat this species as synonymous with Agaricus arvensis.
Spores in Congo Red solution viewed with a x100 immersion objective. 29 October 2020 Hampshire. Photograph copyright Leif Goodwin
Gill edge in Congo Red solution viewed with a x40 objective. 29 October 2020 Hampshire. Photograph copyright Leif Goodwin