Observation 67075: Chlorophyllum brunneum (Farl. & Burt) Vellinga

When: 2011-05-07

Collection location: University of Washington, Seattle, Washington, USA [Click for map]

Who: BlueCanoe

No specimen available

Found at the base of a giant sequoia (Sequoiadendron giganteum) in wood chip mulch and needle litter. Some specimens were partially buried by duff; some were past their prime (soft, infested by fungus gnats, etc). See also observation 97113 and observation 79792.



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Eye3 = Observer’s choice
Eyes3 = Current consensus


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New observation
By: BlueCanoe
2011-10-17 21:08:52 PDT (-0700)

At the same location (observation 79792). Compare and discuss! I am confused as to how abrupt the base of the stipe needs to be.

In comparison,
By: Britney Ramsey (Riverdweller)
2011-10-12 21:08:19 PDT (-0700)
By: BlueCanoe
2011-10-12 20:50:38 PDT (-0700)

Compare to observation 68975, which has a gradually tapering base and a clear double ring.

By: Britney Ramsey (Riverdweller)
2011-10-12 19:55:57 PDT (-0700)

Staining any form of red, orange, saffron, brown….all signs of Chlorophlyllum, and not individual to brunneum.

the first picture (thumbnail) shows..
By: Britney Ramsey (Riverdweller)
2011-10-12 19:23:25 PDT (-0700)

that the top half of the ring is still attached, but soon to break off as the cap expands open. I think this is C. rachodes. There is a bulbous base with no distinct nook or ridge or shelf. The background color of the cap is white and the scales are a walnut brown.
Having said that, I could totally be wrong. I am only assuming the cap with open and pull at that ring and leave a second ridge.

Nice link, thanks!
By: Tim Sage (NMNR)
2011-06-04 00:10:36 PDT (-0700)

I am friends with Daniel! I will have to try to remember to ask him his opinion next meeting, the 14th.

I don’t have a citation.
By: Daniel B. Wheeler (Tuberale)
2011-06-03 23:40:29 PDT (-0700)

There is a discussion of 3 species of Chlorophyllum at this cite though:


Using his photos, apparently C. brunneum is the only species which turns brown when scratched with a fingernail at the base. I believe this was also in the original description of the species, but cannot find where I read that now.

Do you have a link?
By: Tim Sage (NMNR)
2011-06-03 22:03:43 PDT (-0700)

Chlorophyllum rhacodes doesn’t stain at all?

No color change.
By: Daniel B. Wheeler (Tuberale)
2011-06-03 21:29:55 PDT (-0700)
What should C. rhacodes do when scratched?
By: Tim Sage (NMNR)
2011-06-03 20:27:33 PDT (-0700)


Based on new description
By: Daniel B. Wheeler (Tuberale)
2011-06-03 20:09:21 PDT (-0700)

this is almost assuredly C. brunneum. Recent recognition of C. brunneum and the simple field test to distinguish it from C. rachodes (rachoides?) suggests this is a much more abundant species, at least in northern states, than previously believed. Part of the learning process is adapting what you KNOW to be C. rachodes (as I have often called it in the past) to C. brunneum (which is easy for me to find growing in my neighbors’ lawns nearby. Since learning to recognize C. brunneum from the scratch test near the base of the stipe, I have been unable to find any C. rachodes. I too have found it in close proximity to Sequoia giganteum. But locally at least, it also can be found near spruce and birch.

New mushrooms
By: BlueCanoe
2011-06-03 16:44:54 PDT (-0700)

On 6/03/11, I returned to this exact location and found new Chlorophyllum sp. mushrooms. As per Tuberale’s suggestion, I scratched one near the base of the stem and it did turn brown. Also, the bulb was more clearly “abrupt” than the original observation. This suggests C. brunneum.

By: BlueCanoe
2011-05-11 09:51:38 PDT (-0700)

I’ll have to remember that ID tip!

There is a simpler method for determining which species.
By: Daniel B. Wheeler (Tuberale)
2011-05-11 08:27:10 PDT (-0700)

A quick scratch of a fingernail near the base. Should turn brown instantly if C. brunneum.

By: BlueCanoe
2011-05-08 12:47:32 PDT (-0700)

I can’t decide whether my photos show a single- or double-edged ring, and whether these are abrupt or sloping bulbs. Motivation to find better specimens and take better photos!


Created: 2011-05-08 12:06:49 PDT (-0700)
Last modified: 2012-06-11 17:38:05 PDT (-0700)
Viewed: 221 times, last viewed: 2017-06-09 08:30:50 PDT (-0700)
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