Observation 76246: Agaricus campestris L.

When: 2011-09-09

Collection location: Barington Rd., Iowa City, Iowa, USA [Click for map]

Who: Drew Henderson (Hendre17)

No specimen available

Small sized Agaricus(4-6cm cap) fruiting in open grass of a yard. Older specimens.

Temp: 70’s, sunny.



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Add Comment
Thanks Christian-
By: Drew Henderson (Hendre17)
2011-09-13 14:52:58 CDT (-0400)

I just looked up some info online and from Debbie V’s comments on the other A. andrewii post on MO. Seems to me that it is likely this could be A. andrewii due to lack of yellow staining, fibrillose stipe below veil and very smooth white cap. However these were old(fully opened specimens) and it had been very dry weather for about a week.

Guess it could be A. andrewii.

By: Christian (Christian Schwarz)
2011-09-13 14:44:42 CDT (-0400)

to start, A. campestris is a European name, probably shouldn’t be applied to N American material.

There are probably macro-differences (most of what I was finding in PA looked different from west-coast ‘campestris’), but I’d have to make closer observation to really talk about those differences.

Do have a scope-
By: Drew Henderson (Hendre17)
2011-09-13 14:33:54 CDT (-0400)

But I live in Olympia, WA and these were observed last week in Iowa unfortunately…

They did seem smaller and thinner stalked than most A. campestris I’ve found here in Washington though.

wish I would have analyzed it microscopically while in the midwest…

Is difference with spore size and cystidia the only noticeable difference- or are there macro differences to distinguish it from A. campestris?

Do you have a microscope?
By: Christian (Christian Schwarz)
2011-09-13 14:21:51 CDT (-0400)

Checking spore length an presence of cheilocystidia would be great.
These look like Agaricus andrewii, which has larger spores and more cystidia.

Created: 2011-09-13 14:17:36 CDT (-0400)
Last modified: 2011-09-13 14:54:34 CDT (-0400)
Viewed: 51 times, last viewed: 2018-07-30 04:58:42 CDT (-0400)
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