Observation 22397: Agaricus L.

When: 2009-06-12

Collection location: San Francisco, San Francisco Co., California, USA [Click for map]

Who: Micah Courteau (waynegrompsky)

Specimen available

stem stained yellow after picking and handling. young specimens had a pink hue to their gills while the older Agaricus were more of a brown colored gill. Spore print was brown. veil was present on pileus with the mature.


Proposed Names

48% (2)
Recognized by sight: no yellow staining inside the stem base → no Xanthodermatei!
7% (3)
Recognized by sight: may be carneifolius or another species from the leucothites-complex

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
colour of spore print
By: Andreas Gminder (mollisia)
2009-06-22 12:13:26 PDT (-0700)

Are you sure that the specimens from where the spore print originates and the small specimen on the first two pictures are the same species?
the pinkish spore print is very unusual, if not to say impossible, for Agaricus

By: Andreas Gminder (mollisia)
2009-06-22 12:10:11 PDT (-0700)

There are many Agaricus which stain yellow when handled. But the character of the Xanthodermatei group is, that the flesh INSIDE the stem base turns chrome yellow when exposed to air.