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The Horse Mushroom, Agaricus arvensis is a large field-type mushroom that is considered good eating although it can be a little tough.
- about the same size
- have hints of yellow
- have a ring
- have a pale cream cap which may have fine scales.
How to tell the difference
The gills of the poisonous look-alike are initially very pale mustard and darken to a distinct rust brown due to the typical rust coloured spores of Cortinarius mushrooms. The specimen in this photo shows both a section of newly exposed, pale mustard gills. Notice in this photo how much the still attached parts of the cortina looks like an agaricus ring rather than the usual fine threads a Cortinarius web. However, the gill colour identifies this mushroom as a Cortinarius.
Differences in the mature mushroom
The gills of the horse mushroom are chocolate brown even at this fairly early stage. Notice also how much longer the stem is in the horse mushroom.