Growing in open sandy soil. Entire specimen loose, easily dislodged and then reburied in substrate.

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do not exclude all hypothesis
By: Davide Puddu (Davide Puddu)
2016-04-27 01:47:30 PDT (-0700)

It could also be Gyrophragmium dunalii that is very near to the genus Agaricus , Montagnea arenaria is phylogenetically very near to Coprinus s.s. .
Spores are pretty different

Pretty sure
By: Brian Charles (bmcharle)
2016-04-25 17:42:42 PDT (-0700)

Found one of these a couple of weeks ago growing out of sand, got the ID on it. Looks to be the same.