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Observation 10863: Agaricus campestris L.

When: 2008-09-10

Collection location: Hershey, Pennsylvania, USA [Click for map]

Who: James V. Gallagher IV (lbjvg)

No specimen available

location: lawn
cap: convex, white
gills: brown, free, crowded
spores: dark brown
veil: possible remnant attached to cap margin


Spores scraped from prints and stained with Grams Iodine. Magnification=400×. Measurements are length of perpendicular from the base (the base line is the bisected one).

Proposed Names

55% (1)
Used references: Audubon society field guide

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= Observer’s choice
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Add Comment
No distinct odors
By: James V. Gallagher IV (lbjvg)
2008-09-11 19:35:11 MST (-0700)

My odor detector is pretty insensitive. Also, I could not elicit a bruising color reaction. It will be a long time before I eat anything I pick off the ground or tree stump.

What about odor?
By: Debbie Viess (amanitarita)
2008-09-11 08:30:55 MST (-0700)

Smell is one of the most important ways to ID your agaricus sp., esp. if you are considering it for the table. A pleasant (almond or anise or “mushroomy”, like a store-bought bisporus) smell spells ediblity (for some) and an off, phenolic/chemical/library paste odor spells a potentail loss of your lunch.

Campestris tends to be more compact, and they have distinctly pointed bases; check out this grasslands agaricus comparison by Dimitar Bojantchev…