Observation 146925: Agaricus augustus group

When: 2013-09-30

Collection location: Stafford, Clackamas Co., Oregon, USA [Click for map]

Who: Joe Cohen (Joseph D. Cohen)

No specimen available

Agarricus but what species? I was going to guess A. subrutilescens, but then noticed that cap flesh stains yellow near cuticle when cut. Both Arora and Trudell & Ammirati say that A. subrutilescens,is non-staining.
In duff (and possibly bark dust). Nearest tree was a spruce.
I do not have a mature specimen, so cannot tell real maximum sizes and other characters.


  • appears brown from a distance, but actually white, with abundant brown fibrils
  • max diameter 6.5 cm
  • mild almond odor and taste
  • flesh white, 1 cm thick
  • cap flesh stains yellow near cuticle when cut. See 3rd photo.


  • free
  • close
  • young gills off-white
  • 6mm


  • shaggy white starting at partial veil downward for about 1/2 length of stipe, then brown fibrils
  • almost all the stipe was below the duff; only the cap was showing. See 2nd photo
  • 17.5 cm long
  • 2.5 cm thick
  • slightly bulbous base
  • almond taste
  • hollow
  • membranous partial veil still present in all specimens, so I cannot be certain what annulus will look like. But by how it’s attached to the stipe, I’m guessing it will be skirt-like
  • stipe does not stain on cutting or bruising

Species Lists


almost all the stipe is buried
shows staining near cap cuticle

Proposed Names

47% (2)
Used references: Arora, Mushrooms Demystified (2nd ed.); Trudell & Ammirati, Mushrooms of the Pacific Northwest
Based on chemical features: Cap stains yellowish with KOH
56% (1)
Recognized by sight
56% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2013-09-30 20:34:35 PDT (-0700)
Last modified: 2017-07-09 17:07:05 PDT (-0700)
Viewed: 49 times, last viewed: 2017-08-27 06:56:46 PDT (-0700)
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