Observation 191019: Agaricus xanthodermus Genev.

When: 2014-12-01

Collection location: El Dorado, California, USA [Click for map]

Who: Andrew S (AmatoxinAndy)

No specimen available

Several clumps of 3-6 mushrooms observed growing in soil, on leaf litter below blue oak tree. Diameter of cap varies; 7.5-10 cm in featured specimens. Color of cap generally white to off-white with brown-greyish patches, particularly toward center of cap. Cap smooth to flaking in darker areas, dry. Color of gills, which appeared to be free, varied from off-white in unopened specimens, to pink in opened specimens, to chocolate brown in older opened specimens. Skirt-like, off-white ring on upper half of stipe.

Similar specimen with pink gills taken prior day left chocolate brown spore print and had elliptical spores under microscope.

Yellow bruising esp. toward periphery of cap and at base of stipe easily demonstrated in younger specimens; fainter and more difficult to elicit in older specimens. Faded to brownish within 45 minutes.


Younger specimen shows bright yellow staining immediately after cut/bruising
Same young specimen 45 min after cut/bruising

Proposed Names

77% (2)
Eye3 Eyes3
Used references: Arora, Mushrooms Demystified

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2014-12-01 10:56:12 PST (-0800)
Last modified: 2014-12-01 13:54:04 PST (-0800)
Viewed: 15 times, last viewed: 2017-08-11 14:54:24 PDT (-0700)
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