Species: Agaricus arvensis Schaeff.Go Back
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Description:
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This large grassland species is well sought after for eating. There is a similar species, A. crocodilinus, that is claimed to be often mistaken for A. arvensis, but a bit of research shows they can be easily told apart, even if you don't have a microscope. Spores for A. arvensis are 9–11 x 5–6.5 µm, ellipsoid, while those for A. crocodilinus are much smaller at 6-9 x 4-6 µm.  
Common name: Horse Mushroom
Found: Farmland
Substrate: Lawn or Pasture
Spore: Brown
Height: 150 mm
Width: 150 mm
Season: Autumn
Edible: Yes
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Macro images:
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Agaricus arvensisScale bar  
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  Scale = 19 mm.
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Agaricus arvensisScale bar  
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  Scale = 17 mm.
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On occasion, I come across what looks like A. arvensis that I find inside the bush line, and I wonder if these are not A. crocodilinus. The short, stumpy size and small scales around the lower stem make me think it could be. Unfortunately, I have not had the chance to see a mature species or look at these with a microscope.  
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Agaricus arvensisScale bar  
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  Scale = 19 mm.
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Agaricus arvensisScale bar  
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  Scale = 19 mm.
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